build: Bump league/csv from 9.18.0 to 9.20.1

Bumps [league/csv](https://github.com/thephpleague/csv) from 9.18.0 to 9.20.1.
- [Release notes](https://github.com/thephpleague/csv/releases)
- [Changelog](https://github.com/thephpleague/csv/blob/master/CHANGELOG.md)
- [Commits](thephpleague/csv@9.18.0...9.20.1)

---
updated-dependencies:
- dependency-name: league/csv
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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