Update league/flysystem requirement from ^2.2 to ^3.18

[dependabot]

Updates the requirements on league/flysystem to permit the latest version.

Changelog

Sourced from league/flysystem's changelog.

3.18.0 - 2023-10-05

Added

• Configuration option to specify how to handle same path copy/move operations (#1715)

3.17.0 - 2023-10-05

Added

• [AsyncAWS] Added support for version 2.0 of async-aws/{s3,simple-s3}

3.16.0 - 2023-09-07

Added

• [AsyncAws] Allow specifying get_object_options for temporary URL generation

Fixed

• [ZipArchive] override on move
• [WebDAV] encode path for propfind actions
• [PathPrefixing] #1686

3.15.1 - 2023-05-04

Fixed

• Remove duplicate class caused by package extractin and inclusion

3.15.0 - 2023-05-04

Added

• Extracted the local adapter as a standalone package

Changed

• Removed readme's from shipped artefacts.

3.14.0 - 2023-04-11

Added

• Made disabling stat cache configurable for SFTP adapters.

3.13.0 - 2023-04-11

Fixed

... (truncated)

Commits

• 015633a Prep changelog
• bb363f2 Merge pull request #1715 from thephpleague/feature/prevent-same-path-copy-and...
• 532bb63 More consice naming.
• 8cca689 Allow method based config overwrites.
• 8e5ac91 Added ability to set resolution strategy for copy and move conflicts.
• 01e7c17 Remove redundant throw statement.
• c085126 Prevent copy and move to same destinations as the source.
• e5608b5 Merge pull request #1713 from aivchen/update-phpstan
• 47523f6 Update PHPStan and write down all errors to baseline file
• bd4c9b2 Prep changelog
• Additional commits viewable in compare view

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