message: Fix regex in protoc.sh
diff: get_protobuf_tag() {
  if [ "$protobuf_tag" = "latest" ]; then
  - protobuf_tag=$(curl "${curl_opts[@]:?}" https://github.com/protocolbuffers/protobuf/releases/latest 2<&1 | grep -m 1 -Eo "(v[0-9]+.[0-9]+.[0-9]+)" | head -n 1)
  + protobuf_tag=$(curl "${curl_opts[@]:?}" https://github.com/protocolbuffers/protobuf/releases/latest 2<&1 | grep -m 1 -Eo "(v[0-9]+\.[0-9]+\.[0-9]+)" | head -n 1)
  else
  status_code=$(sudo curl -s -w "%{http_code}" -o /tmp/protobuf.tmp "${curl_opts[@]:?}" "https://github.com/protocolbuffers/protobuf/releases/tag/v$protobuf_tag")
  if [ "$status_code" = "200" ]; then
  protobuf_tag="v$protobuf_tag"
  else
  - protobuf_tag=$(curl "${curl_opts[@]:?}" https://github.com/protocolbuffers/protobuf/releases/latest 2<&1 | grep -m 1 -Eo "(v[0-9]+.[0-9]+.[0-9]+)" | head -n 1)
  + protobuf_tag=$(curl "${curl_opts[@]:?}" https://github.com/protocolbuffers/protobuf/releases/latest 2<&1 | grep -m 1 -Eo "(v[0-9]+\.[0-9]+\.[0-9]+)" | head -n 1)
  fi
  fi
  }
  