build(deps): bump num-complex from 0.4.1 to 0.4.2

Bumps [num-complex](https://github.com/rust-num/num-complex) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/rust-num/num-complex/releases)
- [Changelog](https://github.com/rust-num/num-complex/blob/master/RELEASES.md)
- [Commits](rust-num/num-complex@num-complex-0.4.1...num-complex-0.4.2)

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

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