Removes grpc and grpcs from the accepted schemes list

[elena-kolevska]

Description

grpc and grpcs are not valid schemes, as per the gRPC name resolution spec and they're not included in our test matrix, but they were mistakenly left over in the accepted schemes list.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.28%. Comparing base (fc0e9d1) to head (b75de1a).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #700      +/-   ##
==========================================
- Coverage   86.37%   86.28%   -0.09%     
==========================================
  Files          79       82       +3     
  Lines        4094     4172      +78     
==========================================
+ Hits         3536     3600      +64     
- Misses        558      572      +14     

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[marcduiker]

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