[Dependencies] Upgrade to gRPC version 1.46.3

[marcalff]

gRPC will require C++14 starting with release 1.47, see the announcement in 1.46:

https://github.com/grpc/grpc/releases/tag/v1.46.0

Upgrade opentelemetry-cpp to the latest gRPC C++ 11 release available, 1.46.3.

This is a required intermediary upgrade step, while awaiting for a decision on if/how to support:

• C++ 11 gRPC 1.46.3
• C++ 14 gRPC 1.47+
  concurrently in the opentelemetry-cpp code base.

[github-actions]

This issue was marked as stale due to lack of activity.

[marcalff]

gRPC upgraded to 1.48.1 by #1608

Closing