Bump xunit.assert from 2.8.1 to 2.9.1

Bumps [xunit.assert](https://github.com/xunit/xunit) from 2.8.1 to 2.9.1.
- [Commits](xunit/xunit@2.8.1...2.9.1)

---
updated-dependencies:
- dependency-name: xunit.assert
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

test/RedisRateLimiting.Tests/RedisRateLimiting.Tests.csproj

@@ -9,8 +9,8 @@
 		<PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.6" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
 		<PackageReference Include="coverlet.collector" Version="6.0.2" />
-		<PackageReference Include="xunit" Version="2.8.1" />
-		<PackageReference Include="xunit.assert" Version="2.8.1" />
+		<PackageReference Include="xunit" Version="2.9.1" />
+		<PackageReference Include="xunit.assert" Version="2.9.1" />
 		<PackageReference Include="xunit.extensibility.core" Version="2.8.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" />
 	</ItemGroup>