PHP-CS-Fixer 2.x to 3.0

[jreklund]

PHP-CS-Fixer 3.0 where released in may 3, 2021. Latest 2.x where in nov 15, 2021.

Updated default configuration and cache filename. Upgrade guide from 2.x to 3.0.

Q	A
Branch	master
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	yes
Documented?	yes
Fixed tickets

[veewee]

Thanks!