* 7.0:
  List CS fix in .git-blame-ignore-revs
  Fix implicitly-required parameters
  minor #53524 [Messenger] [AmazonSqs] Allow `async-aws/sqs` version 2 (smoench)
  Fix bad merge
  List CS fix in .git-blame-ignore-revs
  Fix implicitly-required parameters
  List CS fix in .git-blame-ignore-revs
  Apply php-cs-fixer fix --rules nullable_type_declaration_for_default_null_value
  [Messenger][AmazonSqs] Allow async-aws/sqs version 2

…-Beru)

This PR was squashed before being merged into the 7.1 branch.

Discussion
----------

[CssSelector] add support for :is() and :where()

| Q             | A
| ------------- | ---
| Branch?       | 7.1
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | Fix #48772
| License       | MIT
| Doc PR        | symfony/symfony-docs#17628

This PR adds support for [:is()](https://developer.mozilla.org/en-US/docs/Web/CSS/:is) and  [:where()](https://developer.mozilla.org/en-US/docs/Web/CSS/:where) pseudo-classes.

Commits
-------

c083e1d6b0 [CssSelector] add support for :is() and :where()

* 7.0:
  Auto-close PRs on subtree-splits
  review German translation

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:
  Add PR template and auto-close PR on subtree split repositories

* 6.4:
  Add PR template and auto-close PR on subtree split repositories