Bump gRPC and opentelemetry-cpp versions.

Move on to gRPC v1.46.7 and opetelemtry-cpp v1.11.0, last versions that support C++11.

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[ ] I have read the CONTRIBUTING document
[ ] If applicable, I have added tests that prove my fix is effective or that my feature works
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nginxinc / nginx-otel

Bump gRPC and opentelemetry-cpp versions. #36

Proposed changes

Checklist