IBX-1439: Dropped league/flysystem-memory dependency

[alongosz]

Question	Answer
JIRA issue	IBX-1439
Requires	ibexa/core#171
Type	feature
Target Ibexa version	v4.4
BC breaks	not for this package
CI build	3765925652, Behat failing due to dep. mismatch

This PR bumps league/flysystem-memory dependency to use Flysystem v2. There are no direct usages of flysystem-memory library, however ibexa/core requires required this as dev dependency, so we either have to do it here as well or make it production dependency in ibexa/core.

PHP Fatal error:  Uncaught LogicException: Missing League\Flysystem\InMemory\InMemoryFilesystemAdapter class. Ensure that league/flysystem-memory package is installed as a dev dependency in /home/runner/work/user/user/vendor/ibexa/core/src/contracts/Test/IbexaTestKernel.php:213

UPDATE: after internal sync we've decided to move the dependency to Composer's require section in ibexa/core#171

TODO

• ❗ REMOVE TMP COMMIT BEFORE MERGE ❗

Checklist:

• Provided PR description.
• Tested the solution manually.
• Provided automated test coverage.
• Checked that target branch is set correctly
• Ran PHP CS Fixer for new PHP code (use $ composer fix-cs).
• Asked for a review

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[alongosz]

Update: league/flysystem-memory is now ibexa/core dependency (see ibexa/core#171)

[tomaszszopinski]

QA approved on IbexaDXP commerce 4.4.x.