Bump Google.Protobuf from 3.21.11 to 3.21.12 (#2195)

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.21.11 to 3.21.12.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.21.11...v3.21.12)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="Ensure.That" Version="10.1.0" />
     <PackageVersion Include="fo-dicom" Version="5.0.3" />
     <PackageVersion Include="fo-dicom.Codecs" Version="5.1.0" />
-    <PackageVersion Include="Google.Protobuf" Version="3.21.11" />
+    <PackageVersion Include="Google.Protobuf" Version="3.21.12" />
     <PackageVersion Include="HashDepot" Version="3.1.0" />
     <PackageVersion Include="Hl7.Fhir.R4" Version="$(Hl7FhirPackageVersion)" />
     <PackageVersion Include="Hl7.Fhir.Support" Version="$(Hl7FhirPackageVersion)" />