chore(deps): Bump FluentAssertions from 6.12.2 to 7.0.0 in the all group

Bumps the all group with 1 update: [FluentAssertions](https://github.com/fluentassertions/fluentassertions).


Updates `FluentAssertions` from 6.12.2 to 7.0.0
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.12.2...7.0.0)

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all
...

Signed-off-by: dependabot[bot] <[email protected]>

src/tests/OpenAI.IntegrationTests/OpenAI.IntegrationTests.csproj

@@ -16,7 +16,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.6.3" />
     <PackageReference Include="MSTest.TestFramework" Version="3.6.3" />
-    <PackageReference Include="FluentAssertions" Version="6.12.2" />
+    <PackageReference Include="FluentAssertions" Version="7.0.0" />
     <PackageReference Include="NUnit" Version="4.2.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
   </ItemGroup>