fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHELOGGINGLOG4J-14532782

Author: snyk-bot

pom.xml

@@ -42,7 +42,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
         <grpc.version>1.66.0</grpc.version>
-        <log4j.version>2.24.3</log4j.version>
+        <log4j.version>2.25.3</log4j.version>
         <exclude-tests>IntegrationTest</exclude-tests>
     </properties>