Bump Microsoft.Extensions.Caching.Abstractions from 2.1.0 to 8.0.0

Bumps Microsoft.Extensions.Caching.Abstractions from 2.1.0 to 8.0.0.

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Caching.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

MockTestUtility/MockTestUtility.csproj

@@ -6,6 +6,7 @@
 
   <ItemGroup>
     <PackageReference Include="MemoryCache.Testing.Moq" Version="1.2.2" />
+    <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
     <PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>