build(deps): bump NUnit from 3.13.3 to 4.3.2

Bumps [NUnit](https://github.com/nunit/nunit) from 3.13.3 to 4.3.2.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@v3.13.3...4.3.2)

---
updated-dependencies:
- dependency-name: NUnit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

APIMatic.Core.Test/APIMatic.Core.Test.csproj

@@ -16,7 +16,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="NUnit" Version="3.13.3" />
+        <PackageReference Include="NUnit" Version="4.3.2" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.3.1" />
         <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
         <PackageReference Include="System.Net.Http.Json" Version="8.0.1" />