chore: Bump OpenFeature from 2.8.1 to 2.9.0

---
updated-dependencies:
- dependency-name: OpenFeature
  dependency-version: 2.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

openfeature/provider_tests/dotnet-integration-tests/ProviderTests/ProviderTests.csproj

@@ -16,7 +16,7 @@
         <PackageReference Include="NUnit3TestAdapter" Version="5.2.0" />
         <PackageReference Include="NUnit.Analyzers" Version="4.10.0" />
         <PackageReference Include="coverlet.collector" Version="6.0.4" />
-        <PackageReference Include="OpenFeature" Version="2.8.1" />
+        <PackageReference Include="OpenFeature" Version="2.9.0" />
         <PackageReference Include="OpenFeature.Contrib.GOFeatureFlag" Version="0.2.1" />
     </ItemGroup>