message: Update protobuf to latest 21.12.
diff: @@ -126,10 +126,10 @@ bison_register_toolchains()
  # A version slightly beyond 21.5 as it fixes a warning
  http_archive(
  name = "com_google_protobuf",
  - sha256 = "efcd93bb1a228d08b4b0fcda00e710592fdf17ce6d0f5c8a239c2db0ba268a3f",
  - strip_prefix = "protobuf-4efbcc44605731dc31507b94f0b81d2bd5ec169b",
  + sha256 = "6a31b662deaeb0ac35e6287bda2f3369b19836e6c9f8828d4da444346f420298",
  + strip_prefix = "protobuf-21.12",
  urls = [
  - "https://github.com/protocolbuffers/protobuf/archive/4efbcc44605731dc31507b94f0b81d2bd5ec169b.zip",
  + "https://github.com/protocolbuffers/protobuf/archive/refs/tags/v21.12.zip",
  ],
  )
  