Bump Google.Protobuf from 3.21.1 to 3.21.7 (#6141)

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.21.1 to 3.21.7.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.21.1...v3.21.7)

---
updated-dependencies:
- dependency-name: Google.Protobuf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/common.props

@@ -16,7 +16,7 @@
     <HyperionVersion>0.12.2</HyperionVersion>
     <NewtonsoftJsonVersion>[12.0.3,)</NewtonsoftJsonVersion>
     <NBenchVersion>2.0.1</NBenchVersion>
-    <ProtobufVersion>3.21.1</ProtobufVersion>
+    <ProtobufVersion>3.21.7</ProtobufVersion>
     <BenchmarkDotNetVersion>0.13.2</BenchmarkDotNetVersion>
     <NetCoreTestVersion>netcoreapp3.1</NetCoreTestVersion>
     <NetTestVersion>net6.0</NetTestVersion>