fix: PhpCsFixer\Tokenizer\Tokens::setSize return type

[kubawerlos]

This time new error was:

Return type of PhpCsFixer\Tokenizer\Tokens::setSize($size): bool should either be compatible with SplFixedArray::setSize(int $size): true, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice

[coveralls]

coverage: 96.034%. remained the same
when pulling e75b2b6 on 6b7562617765726c6f73:fix_php84
into 1eb4e52 on PHP-CS-Fixer:master.

[keradus]

the more of it we will have, the easier it will be for us if we have a todo with description when to drop this and apply the typing change in method header

[Wirone]

For me todo is redundant here, we can prepare major upgrade checklist and put "review all #[ReturnTypeWillChange]" there 🙂.

[keradus]

easier for me to grep for @TODO than for @TODO|ReturnTypeWillChange|sthElseIAlreadyForgotWhatWasIt