Upgrade: PHPUnit 10

[kohlerdominik]

Upgrade to PHPUnit10

Notes:

• Updating BypassFinals was quite a hassle. In the end I got it working by using nunomaduro/mock-final-classes instead of the method providing by dg/bypass-finals using the PHPUnit extension. It seems like, that with the extensions some files are not catched by the stream-wrapper and therefore get not stripped of the final keyword... Might be worth to try to use the extension in PHPUnit11 again.
• The new class QrBillTestDataRepository is an extraction of the former TestQrBillCreatorTrait. Method-names feel dirty, but because there is some magic involved in building a QR-Bill by passing string matching methods, refactoring the whole thing feels out of scope for this upgrade. I suggest to implement a QrBillBuilder instead (with the same functionality but clearer syntax), but I can't invest time into that for now.

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Todos:

• Update to PHPUnit10
• Migrate Dataproviders
• Investigate, why BypassFinals does not work with the recommended method
• Update khanamiryan/qrcode-detector-decoder to resolve deprecation warnings

[kohlerdominik]

@sprain have you seen that I finished this draft? :)