CompatHelper: bump compat for ProtoBuf to 0.11, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the ProtoBuf package from = 0.11.1 to = 0.11.1, 0.11.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

Merging #66 (4121f6c) into master (4bad7b6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   95.56%   95.56%           
=======================================
  Files          13       13           
  Lines         970      970           
=======================================
  Hits          927      927           
  Misses         43       43           

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[DrChainsaw]

Closed by #85