Apply spotless formatting for spotless-maven-plugin 3.x

Collapse empty XML elements to self-closing form as required by the
new default formatting rules in spotless-maven-plugin 3.x.

Author: jbonofre

bom/pom.xml

@@ -24,7 +24,7 @@ under the License.
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
     <version>33</version>
-    <relativePath></relativePath>
+    <relativePath/>
   </parent>
 
   <groupId>org.apache.arrow</groupId>
@@ -78,7 +78,7 @@ under the License.
   </issueManagement>
 
   <properties>
-    <arrow.vector.classifier></arrow.vector.classifier>
+    <arrow.vector.classifier/>
     <!-- org.apache:apache overrides -->
     <minimalJavaBuildVersion>17</minimalJavaBuildVersion>
     <maven.compiler.source>17</maven.compiler.source>
@@ -235,7 +235,7 @@ under the License.
               <file>${maven.multiModuleProjectDirectory}/dev/license/asf-xml.license</file>
               <delimiter>(&lt;configuration|&lt;project)</delimiter>
             </licenseHeader>
-            <sortPom></sortPom>
+            <sortPom/>
           </pom>
         </configuration>
         <executions>

flight/flight-integration-tests/pom.xml

@@ -101,7 +101,7 @@ under the License.
                 </filter>
               </filters>
               <transformers>
-                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"></transformer>
+                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                 <transformer implementation="org.apache.maven.plugins.shade.resource.IncludeResourceTransformer">
                   <resource>META-INF/LICENSE.txt</resource>
                   <file>src/shade/LICENSE.txt</file>

flight/flight-sql-jdbc-driver/pom.xml

@@ -138,7 +138,7 @@ under the License.
                 </relocation>
               </relocations>
               <transformers>
-                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"></transformer>
+                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                 <transformer implementation="org.apache.maven.plugins.shade.resource.IncludeResourceTransformer">
                   <resource>META-INF/LICENSE.txt</resource>
                   <file>src/shade/LICENSE.txt</file>

memory/memory-core/pom.xml

@@ -100,8 +100,8 @@ under the License.
             <phase>test</phase>
             <configuration>
               <!-- Do not inherit the default add-opens flag and excludes -->
-              <argLine combine.self="override"></argLine>
-              <excludes combine.self="override"></excludes>
+              <argLine combine.self="override"/>
+              <excludes combine.self="override"/>
               <includes>
                 <include>**/TestOpens.java</include>
               </includes>

performance/pom.xml

@@ -35,10 +35,10 @@ under the License.
     <skip.perf.benchmarks>true</skip.perf.benchmarks>
     <benchmark.filter>.*</benchmark.filter>
     <benchmark.forks>1</benchmark.forks>
-    <benchmark.jvmargs></benchmark.jvmargs>
+    <benchmark.jvmargs/>
     <benchmark.warmups>5</benchmark.warmups>
     <benchmark.runs>5</benchmark.runs>
-    <benchmark.list></benchmark.list>
+    <benchmark.list/>
     <benchmark.resultfile>jmh-result.json</benchmark.resultfile>
     <benchmark.resultformat>json</benchmark.resultformat>
   </properties>
@@ -143,7 +143,7 @@ under the License.
           <executable>java</executable>
           <arguments>
             <argument>-classpath</argument>
-            <classpath></classpath>
+            <classpath/>
             <argument>org.openjdk.jmh.Main</argument>
             <argument>${benchmark.filter}</argument>
             <argument>-f</argument>

pom.xml

@@ -107,7 +107,7 @@ under the License.
     <dep.avro.version>1.12.1</dep.avro.version>
     <dep.parquet.version>1.17.0</dep.parquet.version>
     <dep.mockito-bom.version>5.23.0</dep.mockito-bom.version>
-    <arrow.vector.classifier></arrow.vector.classifier>
+    <arrow.vector.classifier/>
     <forkCount>2</forkCount>
     <checkstyle.version>10.23.0</checkstyle.version>
     <checkstyle.failOnViolation>true</checkstyle.failOnViolation>
@@ -374,7 +374,7 @@ under the License.
                     </goals>
                   </pluginExecutionFilter>
                   <action>
-                    <ignore></ignore>
+                    <ignore/>
                   </action>
                 </pluginExecution>
                 <pluginExecution>
@@ -387,7 +387,7 @@ under the License.
                     </goals>
                   </pluginExecutionFilter>
                   <action>
-                    <ignore></ignore>
+                    <ignore/>
                   </action>
                 </pluginExecution>
                 <pluginExecution>
@@ -400,7 +400,7 @@ under the License.
                     </goals>
                   </pluginExecutionFilter>
                   <action>
-                    <ignore></ignore>
+                    <ignore/>
                   </action>
                 </pluginExecution>
                 <pluginExecution>
@@ -413,7 +413,7 @@ under the License.
                     </goals>
                   </pluginExecutionFilter>
                   <action>
-                    <ignore></ignore>
+                    <ignore/>
                   </action>
                 </pluginExecution>
                 <pluginExecution>
@@ -734,7 +734,7 @@ under the License.
               <file>${maven.multiModuleProjectDirectory}/dev/license/asf-xml.license</file>
               <delimiter>(&lt;configuration|&lt;project)</delimiter>
             </licenseHeader>
-            <sortPom></sortPom>
+            <sortPom/>
           </pom>
           <java>
             <googleJavaFormat>

tools/pom.xml

@@ -126,7 +126,7 @@ under the License.
                 </filter>
               </filters>
               <transformers>
-                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"></transformer>
+                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                 <transformer implementation="org.apache.maven.plugins.shade.resource.IncludeResourceTransformer">
                   <resource>META-INF/LICENSE.txt</resource>
                   <file>src/shade/LICENSE.txt</file>