Update base image and PHP version to 3.22/PHP8.4

[miguelangel-nubla]

Closes #99

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[thespad]

Grocy docs don't list php 8.4 support, which is why we haven't updated the image yet.

[aptalca]

https://github.com/grocy/grocy?tab=readme-ov-file#platform-support

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[miguelangel-nubla]

Well, as explained in #99 latest is completely broken for some users, including myself, so maybe rollback to Alpine 3.20 until PHP 8.4 support in grocy?

[Dinth]

The :latest simply doesnt work since the rebase at ls291, so even if the PHP8.4 is not officially supported, it cannot get any worse than it is now

And ls290 doesnt have recommended components (opcache)

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