Bump protobuf-java from 3.21.2 to 3.21.7 in /producer_grpc#398

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dependabot/maven/producer_grpc/com.google.protobuf-protobuf-java-3.21.7spring-cloud-samples/spring-cloud-contract-samples:dependabot/maven/producer_grpc/com.google.protobuf-protobuf-java-3.21.7Copy head branch name to clipboard