Bump Microsoft.Identity.Abstractions from 7.2.0 to 9.0.0

---
updated-dependencies:
- dependency-name: Microsoft.Identity.Abstractions
  dependency-version: 9.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

JsonApiToolkit/JsonApiToolkit.csproj

@@ -27,6 +27,7 @@
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.2" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="Microsoft.Identity.Abstractions" Version="9.0.0" />
     <None Include="README.md" Pack="true" PackagePath="\" />
   </ItemGroup>
 </Project>