Bump psych from 4.0.4 to 4.0.6
Bump psych from 4.0.4 to 4.0.6

Bumps [psych](https://github.com/ruby/psych) from 4.0.4 to 4.0.6.
- [Release notes](https://github.com/ruby/psych/releases)
- [Commits](https://github.com/ruby/psych/compare/v4.0.4...v4.0.6)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
unipept/unipept-cli