Docker file uses an older version of protoc than our CI

[jamie256]

Description

The CI sets up protoc 3.19.4 which was carefully chosen to provide relatively wide compatibility of message definitions files supporting both the new protobuf 4.x versions as well as older existing protobuf versions community members reported using. We should use version 3.19.4 in the dockerfile to avoid confusion with developers producing message definition files in dev builds which have different compatibility ranges than the wheels produced in the whylogs CI and release workflows.

Suggestions

Upgrade docker file protoc setup to 3.19.4

• [x] I have reviewed the Guidelines for Contributing and the Code of Conduct.