Bump protobufVersion from 3.21.8 to 3.21.9

Bumps `protobufVersion` from 3.21.8 to 3.21.9.

Updates `protobuf-java` from 3.21.8 to 3.21.9
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.21.8...v3.21.9)

Updates `protoc` from 3.21.8 to 3.21.9
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.21.8...v3.21.9)

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

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

sass-embedded-protocol/build.gradle

@@ -19,7 +19,7 @@ repositories {
     }
 }
 
-def protobufVersion = "3.21.8"
+def protobufVersion = "3.21.9"
 def protocolVersion = "1.1.0"
 
 tasks.withType(com.google.protobuf.gradle.ProtobufExtract).configureEach {