[Form] Update minimal requirement in composer.json

Minimal requirement for PropertyAccess component needs to be `~2.3` as Form component depends on new method `PropertyAccess::createPropertyAccessor()`
update year on licenses
Merge branch '2.3' into 2.4

* 2.3:
  update year on licenses
  rundown and typo fix
  [Process] Fix #9861 : Revert TTY mode
  [Form] Update minimal requirement in composer.json
  Fix Empty translations with Qt files
  Update UPGRADE-2.3.md to account for #9388

Conflicts:
	src/Symfony/Component/Validator/Tests/Constraints/LessThanValidatorTest.php
Merge branch '2.4'

* 2.4:
  udpated LICENSE year
  update year on licenses
  rundown and typo fix
  [Process] Fix #9861 : Revert TTY mode
  [Form] Update minimal requirement in composer.json
  Fix Empty translations with Qt files
  [Console] Fixed command name guessing if an alternative is an alias.
  Update UPGRADE-2.3.md to account for #9388
  [WebProfilerBundle] Fixed profiler toolbar icons for XHTML.
  [BrowserKit] Throw exception on invalid cookie expiration timestamp
  [Propel1Bridge][ModelChoiceList] add exception message for invalid classes