feat: migrate otelgrpc to stats handlers and update dependencies

[erka]

Modernize OpenTelemetry gRPC instrumentation by migrating from deprecated
interceptors to the newer stats handler API supported by grpchan.

[dosubot]

Documentation Updates

Checked 4 published document(s). No updates required.

^{How did I do? Any feedback?}  

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.27%. Comparing base (96b3019) to head (9dc2109).
⚠️ Report is 1 commits behind head on v2.

Files with missing lines	Patch %	Lines
internal/cmd/grpc.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #4895      +/-   ##
==========================================
- Coverage   60.29%   60.27%   -0.03%     
==========================================
  Files         136      136              
  Lines       13375    13373       -2     
==========================================
- Hits         8065     8061       -4     
- Misses       4629     4630       +1     
- Partials      681      682       +1     

Flag	Coverage Δ
integrationtests	34.92% <33.33%> (-0.02%)	⬇️
unittests	51.29% <0.00%> (+0.02%)	⬆️

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[markphelps]

thank you! id like to wait for this to get merged into the upstream instead of depending on a fork if possible

[markphelps]

awesome! thank you for taking this on