Bump Microsoft.Extensions.DependencyInjection.Abstractions

Bumps [Microsoft.Extensions.DependencyInjection.Abstractions](https://github.com/aspnet/Extensions) from 3.1.5 to 3.1.6.
- [Release notes](https://github.com/aspnet/Extensions/releases)
- [Commits](dotnet/extensions@v3.1.5...v3.1.6)

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

src/FluentRest.Factory/FluentRest.Factory.csproj

@@ -10,7 +10,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.5" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.6" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="3.1.5" />
   </ItemGroup>