Bump protobuf.version from 3.25.5 to 3.25.6 (#3138)

Bumps `protobuf.version` from 3.25.5 to 3.25.6.

Updates `com.google.protobuf:protobuf-java` from 3.25.5 to 3.25.6
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.25.5...v3.25.6)

Updates `com.google.protobuf:protobuf-java-util` from 3.25.5 to 3.25.6

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.google.protobuf:protobuf-java-util
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

parquet-protobuf/pom.xml

@@ -31,7 +31,7 @@
 
   <properties>
     <elephant-bird.version>4.4</elephant-bird.version>
-    <protobuf.version>3.25.5</protobuf.version>
+    <protobuf.version>3.25.6</protobuf.version>
     <common-protos.version>2.50.0</common-protos.version>  <!-- make sure it's compatible with protobuf.version -->
     <truth-proto-extension.version>1.4.4</truth-proto-extension.version>
   </properties>