Bump league/flysystem from 1.0.53 to 1.0.55

Bumps [league/flysystem](https://github.com/thephpleague/flysystem) from 1.0.53 to 1.0.55.
- [Release notes](https://github.com/thephpleague/flysystem/releases)
- [Changelog](https://github.com/thephpleague/flysystem/blob/master/changelog.md)
- [Commits](thephpleague/flysystem@1.0.53...1.0.55)

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