Allow final modifier when using a method from a trait (#11394)

Fixes GH-11388.

Following https://wiki.php.net/rfc/horizontalreuse which introduced traits,
this should be allowed

Allow final modifier when using a method from a trait (#11394)

Fixes GH-11388.

Following https://wiki.php.net/rfc/horizontalreuse which introduced traits,
this should be allowed.
The implementation was refactored in 3f8c729. That commit is the first time
the "final" check appears AFAICT, but no reason was given for why. That
commit seems to have landed in 5.4.11 and the NEWS for that version doesn't
seem to mention something relevant to the behaviour change.
This patch removes the restriction of the final modifier.

Closes GH-11394.

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