message: Remove proto dependency.
  This seems to be unused.
diff: @@ -15,14 +15,6 @@ load("@tink_java//:tink_java_deps_init.bzl", "tink_java_deps_init")
  tink_java_deps_init()
  -# Required by gRPC, which would fetch v3.21.7 otherwise.
  -http_archive(
  - name = "com_google_protobuf_javalite",
  - sha256 = "04e1ed9664d1325b43723b6a62a4a41bf6b2b90ac72b5daee288365aad0ea47d",
  - strip_prefix = "protobuf-3.20.3",
  - urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.19.3.zip"],
  -)
  -
  # Release from 2022-04-28.
  http_archive(
  name = "io_grpc_grpc_java",
  