Bump NSubstitute from 3.1.0 to 4.0.0
Bump NSubstitute from 3.1.0 to 4.0.0

Bumps [NSubstitute](https://github.com/nsubstitute/NSubstitute) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/nsubstitute/NSubstitute/releases)
- [Changelog](https://github.com/nsubstitute/NSubstitute/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nsubstitute/NSubstitute/compare/v3.1.0...v4.0.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Fody/Scalpel