Update module google.golang.org/grpc to v1.72.2

This MR contains the following updates:

Package	Type	Update	Change
google.golang.org/grpc	require	patch	v1.72.1 -> v1.72.2

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Release Notes

grpc/grpc-go (google.golang.org/grpc)

v1.72.2: Release 1.72.2

Compare Source

Bug Fixes

• client: restore support for NO_PROXY environment variable when connecting to locally-resolved addresses (case 2 from gRFC A1). (#​8329)
• balancer/least_request: fix panic on resolver errors. (#​8333)

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