This reverts commit 2c9352dd91ebaf37b8a3e3c26fd8e1306df2fb73, reversing
changes made to 18c3e87f1512be2cc50e90235b144b13bc347258.

* 5.4:
  Revert "minor #54653 Auto-close PRs on subtree-splits (nicolas-grekas)"

* 6.4:
  Remove subtree split checks
  Revert "minor #54653 Auto-close PRs on subtree-splits (nicolas-grekas)"

* 7.0:
  Remove subtree split checks
  Revert "minor #54653 Auto-close PRs on subtree-splits (nicolas-grekas)"

* 5.4:
  not registered definitions must not be modified
  [String] Fix Inflector for 'hardware'
  Bump Symfony version to 5.4.41
  Update VERSION for 5.4.40
  Update CONTRIBUTORS for 5.4.40
  Update CHANGELOG for 5.4.40

* 6.4:
  not registered definitions must not be modified
  fix low deps
  [String] Fix Inflector for 'hardware'
  [Mime] Use streams instead of loading raw message generator into memory
  Bump Symfony version to 6.4.9
  Update VERSION for 6.4.8
  Update CHANGELOG for 6.4.8
  Bump Symfony version to 5.4.41
  Update VERSION for 5.4.40
  Update CONTRIBUTORS for 5.4.40
  Update CHANGELOG for 5.4.40

* 7.0:
  not registered definitions must not be modified
  fix low deps
  [String] Fix Inflector for 'hardware'
  [Mime] Use streams instead of loading raw message generator into memory
  Bump Symfony version to 7.0.9
  Update VERSION for 7.0.8
  Update CHANGELOG for 7.0.8
  Bump Symfony version to 6.4.9
  Update VERSION for 6.4.8
  Update CHANGELOG for 6.4.8
  Bump Symfony version to 5.4.41
  Update VERSION for 5.4.40
  Update CONTRIBUTORS for 5.4.40
  Update CHANGELOG for 5.4.40