Log Message:
{py-,}protobuf: update to 3.19.1

2021-10-28 version 3.19.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)

  Bazel
  * Ensure that release archives contain everything needed for Bazel (#9131)
  * Align dependency handling with Bazel best practices (#9165)

  JavaScript
  * Fix `ReferenceError: window is not defined` when getting the global object \ 
(#9156)

  Ruby
  * Fix memory leak in MessageClass.encode (#9150)