build: bump grpcio limits and handle erratic gRPC channel creation

[RobPasMue]

Closes #1655

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.38%. Comparing base (c5cd303) to head (253d636).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1913      +/-   ##
==========================================
+ Coverage   90.37%   90.38%   +0.01%     
==========================================
  Files         111      111              
  Lines        9419     9431      +12     
==========================================
+ Hits         8512     8524      +12     
  Misses        907      907              

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[RobPasMue]

Follow up links - see #1904 (comment)