Bump NUnit from 3.13.2 to 3.13.3 (#749)

Bumps [NUnit](https://github.com/nunit/nunit) from 3.13.2 to 3.13.3.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/v3.13.3/CHANGES.md)
- [Commits](nunit/nunit@v3.13.2...v3.13.3)

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

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

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

Author: dependabot[bot]

SpotifyAPI.Web.Tests/SpotifyAPI.Web.Tests.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
     <PackageReference Include="Moq" Version="4.17.2" />
-    <PackageReference Include="NUnit" Version="3.13.2" />
+    <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
     <PackageReference Include="NUnit.Console" Version="3.15.0" />
   </ItemGroup>