* 4.0: (23 commits)
Clean up
Update return type in docblock.
PHP CS Fixer: no need to exclude xml and yml files
PHP CS Fixer: no need to exclude json file
[#22749] fix version in changelog
Update LICENSE year... forever
fixed some deprecation messages
fixed CS
Fixes for Oracle in PdoSessionHandler
fixed some deprecation messages
fixed some deprecation messages
fixed some deprecation messages
fixed some deprecation messages
Remove dead code
[TwigBundle/Brige] catch missing requirements to throw meaningful exceptions
[DI] fix CS
[HttpKernel] Call Response->setPrivate() instead of sending raw header() when session is started
[FrameworkBundle] Make cache:clear "atomic" and consistent with cache:warmup
Suggest to write an implementation if the interface cannot be autowired
[Debug] Skip DebugClassLoader checks for already parsed files
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