Update google-protobuf to v3.21.7
What does this MR do and why?
This doesn't appear to have any Ruby-specific changes, but some security scanners have picked up on a vulnerability in the Java implementation.
Full diff: https://github.com/protocolbuffers/protobuf/compare/v3.21.5...v3.21.7
Relates to gitaly#4534 (closed)
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Stan Hu