Bump Microsoft.AspNetCore.Mvc from 2.2.0 to 2.3.9

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.Mvc
  dependency-version: 2.3.9
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

FirebaseAdmin/FirebaseAdmin.Snippets/FirebaseAdmin.Snippets.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Google.Apis.Auth" Version="1.73.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageReference Include="Microsoft.AspNetCore.Http" Version="2.3.9" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.3.9" />
     <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageReference Include="System.Text.Json" Version="8.0.5" /> 
     <PackageReference Include=" System.Security.Cryptography.Xml" Version="8.0.2" />