chore(deps): bump Google.Api.CommonProtos in /src/Flipt.Grpc (#50)

Bumps [Google.Api.CommonProtos](https://github.com/googleapis/gax-dotnet) from 2.10.0 to 2.16.0.
- [Release notes](https://github.com/googleapis/gax-dotnet/releases)
- [Changelog](https://github.com/googleapis/gax-dotnet/blob/main/CHANGELOG.md)
- [Commits](googleapis/gax-dotnet@Google.Api.CommonProtos-2.10.0...Google.Api.CommonProtos-2.16.0)

---
updated-dependencies:
- dependency-name: Google.Api.CommonProtos
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Flipt.Grpc/flipt-grpc.csproj

@@ -16,7 +16,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Api.CommonProtos" Version="2.10.0" />
+    <PackageReference Include="Google.Api.CommonProtos" Version="2.16.0" />
     <PackageReference Include="Grpc.Net.Client" Version="2.67.0" />
     <None Include="../../README.md" Pack="true" PackagePath="/" />
   </ItemGroup>