Bump Google.Protobuf from 3.21.7 to 3.21.9

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.21.7 to 3.21.9.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.21.7...v3.21.9)

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

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

src/coordination/azure/Akka.Coordination.Azure/Akka.Coordination.Azure.csproj

@@ -19,7 +19,7 @@
 		<PackageReference Include="Akka.Cluster.Hosting" Version="$(AkkaHostingVersion)" />
 		<PackageReference Include="Azure.Identity" Version="1.6.1" />
 		<PackageReference Include="Azure.Storage.Blobs" Version="12.14.1" />
-		<PackageReference Include="Google.Protobuf" Version="3.21.6" />
+		<PackageReference Include="Google.Protobuf" Version="3.21.9" />
 		<PackageReference Include="Grpc.Tools" Version="2.50.0">
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 			<PrivateAssets>all</PrivateAssets>

src/discovery/azure/Akka.Discovery.Azure/Akka.Discovery.Azure.csproj

@@ -15,7 +15,7 @@
       <PackageReference Include="Akka.Hosting" Version="$(AkkaHostingVersion)" />
       <PackageReference Include="Azure.Data.Tables" Version="12.6.1" />
       <PackageReference Include="Azure.Identity" Version="1.7.0" />
-      <PackageReference Include="Google.Protobuf" Version="3.21.7" />
+      <PackageReference Include="Google.Protobuf" Version="3.21.9" />
       <PackageReference Include="Grpc.Tools" Version="2.50.0">
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         <PrivateAssets>all</PrivateAssets>