Bump Grpc.Net.Client from 2.67.0 to 2.71.0 #1132

Job	Run time
build-container / build-container (ubuntu-22.04, alpine, linux-musl, x64)	6m 50s
build-ubuntu1604-native / build-ubuntu1604-native-container	4m 19s
build-container / build-container (ubuntu-22.04-arm, alpine, linux-musl, arm64)	6m 18s
build / build (ubuntu-22.04, /var/log/opentelemetry/dotnet)	4m 40s
build / build (windows-2022, /c/ProgramData/OpenTelemetry .NET AutoInstrumentation/logs)	40s
build / build (macos-13, /var/log/opentelemetry/dotnet)	6m 55s
build / build (ubuntu-22.04-arm, /var/log/opentelemetry/dotnet)	4m 45s
test-build-managed	0s
test-build-windows-container-tests	0s
test-build-native	0s
build-nuget-packages	0s
test-build-container	0s
test-jobs	0s
test-nuget-packages	0s
	34m 27s

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