Bump com.diffplug.spotless:spotless-maven-plugin from 3.2.1 to 3.4.0

Bumps [com.diffplug.spotless:spotless-maven-plugin](https://github.com/diffplug/spotless) from 3.2.1 to 3.4.0.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@maven/3.2.1...maven/3.4.0)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-maven-plugin
  dependency-version: 3.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -347,7 +347,7 @@ limitations under the License.
 
     <project.build.outputTimestamp>2026-01-03T12:01:32Z</project.build.outputTimestamp>
     <gpg.useagent>true</gpg.useagent>
-    <spotless-maven-plugin.version>3.2.1</spotless-maven-plugin.version>
+    <spotless-maven-plugin.version>3.4.0</spotless-maven-plugin.version>
     <mavenPluginToolsVersion>3.15.2</mavenPluginToolsVersion>
     <mavenFluidoSkinVersion>2.1.0</mavenFluidoSkinVersion>
     <mavenSurefireVersion>3.5.5</mavenSurefireVersion>