Lock grpc at 1.63.0

Thiago Figueirórequested to merge
revert-grpc-1.72 into master

What does this MR do and why?

Revert Unlock and update grpc gem to 1.72.0 (!191419 - merged) due to 2025-06-25: GitLab jobs timing-out, causing mas... (gitlab-com/gl-infra/production#20067 - closed)

Restore the lock for grpc at 1.63.0.

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