fix: samples/client/petstore/java/webclient/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-12485149
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-12485150
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-12485151
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-12817817
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-11799531

Author: snyk-bot

samples/client/petstore/java/webclient/pom.xml

@@ -123,10 +123,10 @@
         <jackson-version>2.17.1</jackson-version>
         <jackson-databind-version>2.17.1</jackson-databind-version>
         <jackson-databind-nullable-version>0.2.6</jackson-databind-nullable-version>
-        <spring-boot-version>2.7.17</spring-boot-version>
+        <spring-boot-version>3.4.10</spring-boot-version>
         <jakarta-annotation-version>1.3.5</jakarta-annotation-version>
         <reactor-version>3.4.34</reactor-version>
-        <reactor-netty-version>1.0.39</reactor-netty-version>
+        <reactor-netty-version>1.2.10</reactor-netty-version>
         <junit-version>5.10.2</junit-version>
     </properties>
 </project>