Use composer/xdebug-handler v3

[gharlan]

closes #6213

[coveralls]

Coverage remained the same at 93.115% when pulling 8e29121 on gharlan:xdebug-handler into 8f10396 on FriendsOfPHP:master.

[stof]

To reduce the risk of dependency conflicts, I suggest supporting both 2 and 3, as there does not seem to be any change needed in php-cs-fixer between those versions.

[keradus]

I'm happy to merge v3 only and reconsider support for v2 if we would see complaints and ppl not updating because of that. ultimately, upcoming shim package would solve the dependencies conflicts once and for all

[SpacePossum]

Thank you @gharlan.

[ankorstore-haddowg]

@keradus @SpacePossum please add back support for v2 here.
i am unable to upgrade as the composer/composer package itself has not yet updated its dependency on xdebug-handler and thats a dependency of phpstan which we also use.
looks like there is no reason for this not to support 2 also as the only reason 3 was a major is that it removed compatibility for older php version which this package already no longer supports.

[SpacePossum]

hi, can you maybe make a PR of it?

[keradus]

as alternative - would a shim package fix the situation here?