bridgy-fed build(deps): bump protobuf from 3.20.1 to 4.21.4

Bumps protobuf from 3.20.1 to 4.21.4.

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Jul 27 '22 12:07 dependabot[bot]

Looks like a major version upgrade! Skipping auto-merge.

Jul 27 '22 12:07 github-actions[bot]

@dependabot ignore this major version

Aug 09 '22 22:08 snarfed

OK, I won't notify you about version 4.x.x again, unless you re-open this PR or update to a 4.x.x release yourself.

Aug 09 '22 22:08 dependabot[bot]