chore: Bump FluentAssertions from 8.7.1 to 8.8.0 (#4138)

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

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

@@ -10,7 +10,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="8.7.1" />
+        <PackageReference Include="FluentAssertions" Version="8.8.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
         <PackageReference Include="NUnit" Version="4.4.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="5.2.0" />