chore(deps): bump protobuf in /hiero-dependency-versions

Bumps `protobuf` from 4.30.0 to 4.31.1.

Updates `com.google.protobuf:protobuf-java` from 4.30.0 to 4.31.1
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v4.30.0...v4.31.1)

Updates `com.google.protobuf:protobuf-javalite` from 4.30.0 to 4.31.1

Updates `com.google.protobuf:protoc` from 4.30.0 to 4.31.1
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v4.30.0...v4.31.1)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-version: 4.31.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.google.protobuf:protobuf-javalite
  dependency-version: 4.31.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.google.protobuf:protoc
  dependency-version: 4.31.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

hiero-dependency-versions/build.gradle.kts

@@ -10,7 +10,7 @@ group = "org.hiero"
 
 val bouncycastle = "1.80"
 val grpc = "1.72.0"
-val protobuf = "4.30.0"
+val protobuf = "4.31.1"
 val slf4j = "2.0.17"
 val mockito = "5.18.0"