Set h2 as the ALPN for the gRPC TLS

[dhurley]

Proposed changes

Set h2 as the ALPN for the gRPC TLS.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.02%. Comparing base (4a95e53) to head (3cce03c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1581   +/-   ##
=======================================
  Coverage   85.02%   85.02%           
=======================================
  Files         103      103           
  Lines       13589    13590    +1     
=======================================
+ Hits        11554    11555    +1     
  Misses       1518     1518           
  Partials      517      517           

Files with missing lines	Coverage Δ
internal/grpc/grpc.go	81.89% <100.00%> (+0.07%)	⬆️

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