nuget: bump NUnit from 3.12.0 to 3.13.3 (#4060)
Bumps [NUnit](https://github.com/nunit/nunit) from 3.12.0 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](https://github.com/nunit/nunit/compare/v3.12...v3.13.3)
---
updated-dependencies:
- dependency-name: NUnit
dependency-type: direct:production
update-type: version-update:semver-minor
...
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