Update dependency com.google.protobuf:protobuf-bom to v3.25.6

Author: renovate[bot]

build.gradle

@@ -16,7 +16,7 @@ buildscript {
         // https://github.com/google/guava/releases
         guavaVersion = '33.2.1-jre'
         // https://github.com/protocolbuffers/protobuf/releases
-        protobufVersion = '3.25.3'
+        protobufVersion = '3.25.6'
         protobufGradlePluginVersion = '0.9.4'
 
         // https://github.com/spring-projects/spring-boot/releases