Upgrade protobuf to v3.25.5.

Earlier versions are impacted by `CVE-2024-7254`. Even though
we don't use groups or nested fields and mostly are not impacted directly.
We upgrade nonetheless to ensure safe use in case on unknown fields.

Author: G8XSU

java/app/build.gradle

@@ -1,6 +1,6 @@
 buildscript {
   ext.protobufPlugInVersion = '0.9.4'
-  ext.protobufVersion = '3.21.7'
+  ext.protobufVersion = '3.25.5'
   ext.jerseyVersion = '3.1.0'
   ext.junitVersion = '5.9.0'
   ext.mockitoVersion = '5.2.0'