Fix PHP 8.4 deprecations

Implicitly nullable parameter declarations are deprecated in PHP 8.4. The proposed change is safe and is not considered by PHP as a signature change, see https://php.watch/versions/8.4/implicitly-marking-parameter-type-nullable-deprecated

Unfortunately, this syntax is compatible only with PHP >= 7.1. I propose to raise the minimal PHP requirement to 7.1.

Ping @wapmorgan

PHP 8.4 is coming soon :)

Quality Gate passed

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I need to revert upgrade to 7.1