chore(deps): Bump NUnit from 4.2.2 to 4.3.0 in the all group

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


Updates `NUnit` from 4.2.2 to 4.3.0
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@4.2.2...4.3.0)

---
updated-dependencies:
- dependency-name: NUnit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
...

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

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

@@ -17,7 +17,7 @@
     <PackageReference Include="MSTest.TestAdapter" Version="3.6.4" />
     <PackageReference Include="MSTest.TestFramework" Version="3.6.4" />
     <PackageReference Include="FluentAssertions" Version="7.0.0" />
-    <PackageReference Include="NUnit" Version="4.2.2" />
+    <PackageReference Include="NUnit" Version="4.3.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
   </ItemGroup>