Bump Microsoft.Extensions.Identity.Core from 8.0.10 to 9.0.0

Bumps [Microsoft.Extensions.Identity.Core](https://github.com/dotnet/aspnetcore) from 8.0.10 to 9.0.0.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v8.0.10...v9.0.0)

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

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

src/Cosmos.Identity/Cosmos.Identity.csproj

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <PackageReference Include="Cosmos.Abstracts" Version="6.2.3" />
-    <PackageReference Include="Microsoft.Extensions.Identity.Core" Version="8.0.10" />
+    <PackageReference Include="Microsoft.Extensions.Identity.Core" Version="9.0.0" />
   </ItemGroup>
 
   <ItemGroup>