*: upgrade grpc to v1.47.0

[pav-kv]

Fixes #81227

Release note: upgrade grpc from v1.46.0 to v.1.47.0 which fixes a subtle bug
causing panic on a nil pointer.

[cockroach-teamcity]

This change is 

[erikgrinaker]

LGTM, but we should squash this into a single commit so the deps aren't out of sync on the first one.

[pav-kv]

bors r=erikgrinaker

[craig]

Build failed:

• Bazel Essential CI (Cockroach)

[pav-kv]

bors retry

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)

[pav-kv]

blathers backport 22.2

[blathers-crl]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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error creating merge commit from a2089f9 to blathers/backport-release-22.2-88470: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 22.2 failed. See errors above.

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