Bump Google.Protobuf from 3.20.1 to 3.21.7

[dependabot[bot]]

Bumps Google.Protobuf from 3.20.1 to 3.21.7.

Release notes

Sourced from Google.Protobuf's releases.

Protocol Buffers v3.20.3

Java

• Refactoring java full runtime to reuse sub-message builders and prepare to migrate parsing logic from parse constructor to builder.
• Move proto wireformat parsing functionality from the private "parsing constructor" to the Builder class.
• Change the Lite runtime to prefer merging from the wireformat into mutable messages rather than building up a new immutable object before merging. This way results in fewer allocations and copy operations.
• Make message-type extensions merge from wire-format instead of building up instances and merging afterwards. This has much better performance.
• Fix TextFormat parser to build up recurring (but supposedly not repeated) sub-messages directly from text rather than building a new sub-message and merging the fully formed message into the existing field.

Protocol Buffers v3.20.2

C++

• Reduce memory consumption of MessageSet parsing
• This release addresses a Security Advisory for C++ and Python users

Commits

• 54489e9 Updating changelog
• 5fc03e1 Updating version.json and repo version numbers to: 21.7
• a3888f5 Clean up TextFormat parser (#10673)
• 3b5301c Refactoring Java parsing (21.x) (#10665)
• bea6726 Merge pull request #10579 from protocolbuffers/21.x-202209142140
• b1924e1 Update version.json to: 21.7-dev
• 929e13d Merge pull request #10572 from deannagarcia/21.x
• de7597e Update python/release.sh to handle delay between twine upload and pip install...
• 480bd3b Merge pull request #10557 from protocolbuffers/21.x-202209132118
• aa8c73d Updating changelog
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)