Bump Microsoft.FeatureManagement.AspNetCore from 3.0.0 to 3.1.1 (#22)

Bumps [Microsoft.FeatureManagement.AspNetCore](https://github.com/Azure/AppConfiguration) from 3.0.0 to 3.1.1.
- [Commits](https://github.com/Azure/AppConfiguration/commits)

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

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src/Testing/Testing.csproj

@@ -16,7 +16,7 @@
         <PackageReference Include="Bogus" Version="35.0.1"/>
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
         <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.0" />
-        <PackageReference Include="Microsoft.FeatureManagement.AspNetCore" Version="3.0.0" />
+        <PackageReference Include="Microsoft.FeatureManagement.AspNetCore" Version="3.1.1" />
         <PackageReference Include="Nito.AsyncEx" Version="5.1.2"/>
         <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="7.0.0"/>
         <PackageReference Include="Respawn" Version="6.1.0"/>