Bump Google.Protobuf in /src/Services/Ordering/Ordering.API

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.14.0...v3.15.0)

---
updated-dependencies:
- dependency-name: Google.Protobuf
  dependency-type: direct:production
...

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

src/Services/Ordering/Ordering.API/Ordering.API.csproj

@@ -45,7 +45,7 @@
     <PackageReference Include="Azure.Identity" Version="1.4.0" />
     <PackageReference Include="Dapper" Version="2.0.78" />
     <PackageReference Include="FluentValidation.AspNetCore" Version="9.3.0" />
-    <PackageReference Include="Google.Protobuf" Version="3.14.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.AspNetCore.Server" Version="2.34.0" />
     <PackageReference Include="Grpc.Tools" Version="2.34.0" PrivateAssets="All" />
     <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="9.0.0" />