fix: samples/client/echo_api/java/restclient/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-15701755

Author: snyk-bot

samples/client/echo_api/java/restclient/pom.xml

@@ -274,7 +274,7 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <spring-web-version>6.1.21</spring-web-version>
+        <spring-web-version>6.2.17</spring-web-version>
         <jackson-version>2.19.2</jackson-version>
         <jackson-databind-version>2.19.2</jackson-databind-version>
         <jackson-databind-nullable-version>0.2.7</jackson-databind-nullable-version>