build(deps): bump com.google.protobuf from 0.9.4 to 0.9.6

Bumps com.google.protobuf from 0.9.4 to 0.9.6.

---
updated-dependencies:
- dependency-name: com.google.protobuf
  dependency-version: 0.9.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -59,7 +59,7 @@ playServicesCloudMessaging = "17.2.0"
 playServicesStats = "17.0.2"
 playServicesVision = "20.1.3"
 protoGoogleCommonProtos = "1.18.0"
-protobufGradlePlugin = "0.9.4"
+protobufGradlePlugin = "0.9.6"
 protobufjavautil = "3.25.5"
 protoc = "3.25.5"
 quickcheck = "0.6"