PHPCSStandards / PHP_CodeSniffer / 14208278472

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PHP 8.1 | Tokenizer/PHP: fix nullable type tokenization for readonly properties

The `?` in a type for a `readonly` property declared without visibility, would be tokenized as `T_INLINE_THEN`, not `T_NULLABLE`.

Fixed now.

Includes perfunctory test.
Realistically, a lot more tests are needed for the `T_NULLABLE` vs `T_INLINE_THEN` tokenization, but at least, this is a start and covers the current change.

3 of 3 new or added lines in 1 file covered. (100.0%)

19312 of 24902 relevant lines covered (77.55%)

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