Bump league/flysystem from 2.3.2 to 2.4.0 (#128)

Bumps [league/flysystem](https://github.com/thephpleague/flysystem) from 2.3.2 to 2.4.0.
- [Release notes](https://github.com/thephpleague/flysystem/releases)
- [Changelog](https://github.com/thephpleague/flysystem/blob/2.x/CHANGELOG.md)
- [Commits](thephpleague/flysystem@2.3.2...2.4.0)

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

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