Update php-stemmer to 4.0 as workaround for full PHP 8.4 compatibility

[DerDreschner]

As discussed in #1017, php-stemmer is a dependency of RubixML. They currently point to the version 3.0 of php-stemmer, which isn't fully compatible with PHP 8.4 due to a dependency on portable-utf8, which isn't that well maintained anyway. This issue is already handled by the maintainers of php-stemmer by releasing the version 4.0, which replaced portable-utf8 with joomla/string. This isn't a breaking change, so, the version bump was done just in case.

Until RubixML uses the latest version (see RubixML/ML#359), we can deploy a workaround and use php-stemmer 4.0 by using it as alias for version 3.0.

This fixes #1017.

[ChristophWurst]

Nice, thank you very much

[ChristophWurst]

@AndyXheli could you please give this a test? Thanks

[DerDreschner]

@ChristophWurst : I've run php-cs here as well and squashed everything again. Could you please approve it again? Thanks!

[DerDreschner]

@ChristophWurst : php-cs-fixer needs to be updated as the version in vendor-bin isn't compatible with PHP 8.4, yet the nextcloud-version-matrix now wants to run against it.

[DerDreschner]

Created a bug report in nextcloud/coding-standard, as this is the package that the outdated version comes from (although we don't use the current version from them - but that doesn't matter as they didn't changed it in the latest version at all).

[DerDreschner]

#1028 should fix the issue as recommended by this comment.

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[ChristophWurst]

/backport to stable32

[ChristophWurst]

Apologies for the late approval/merge