Merge branch '5.4' into 6.0

* 5.4:
  [Cache] fix connecting to local Redis sockets
  Fix appveyor config for deprecations
  Skip deprecation coming from DBAL 3.2
  Add Suggestion class for more advanced completion suggestion
  [HttpClient] Add Klaxoon as a backer to the README
  [Translation] Add Lokalise as a backer to the READMEs
  [Translation] Add Crowdin as a backer to the READMEs
  [Security] Add SymfonyCasts as a backer to the READMEs
  [Notifier] Add Mercure.rocks as a backer to the README
  [Messenger][Process] Add SensioLabs as a backer to the README
  [HttpKernel][Console] Add Les-Tilleuls.coop as a backer to the README
  [HttpFoundation] Add Laravel as a backer to the README
  Allow v3 contracts where possible

Author: nicolas-grekas

README.md

@@ -4,6 +4,16 @@ HttpFoundation Component
 The HttpFoundation component defines an object-oriented layer for the HTTP
 specification.
 
+Sponsor
+-------
+
+The HttpFoundation component for Symfony 5.4/6.0 is [backed][1] by [Laravel][2].
+
+Laravel is a PHP web development framework that is passionate about maximum developer
+happiness. Laravel is built using a variety of bespoke and Symfony based components.
+
+Help Symfony by [sponsoring][3] its development!
+
 Resources
 ---------
 
@@ -12,3 +22,7 @@ Resources
  * [Report issues](https://github.com/symfony/symfony/issues) and
    [send Pull Requests](https://github.com/symfony/symfony/pulls)
    in the [main Symfony repository](https://github.com/symfony/symfony)
+
+[1]: https://symfony.com/backers
+[2]: https://laravel.com/
+[3]: https://symfony.com/sponsor

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=8.0.2",
-        "symfony/deprecation-contracts": "^2.1|^3.0",
+        "symfony/deprecation-contracts": "^2.1|^3",
         "symfony/polyfill-mbstring": "~1.1"
     },
     "require-dev": {