v2.3.1: Merge branch '5.1' into 5.x

* 5.1:
  [Contracts] add branch-aliases for dev-main
  [Cache] Make Redis initializers static
  [Messenger] Fixed typos in Connection
  [CI] Fixed build on AppVeyor
  Fix tests typo
  [Lock] Reset Key lifetime time before we acquire it
  [CI] Silence errors when remove file/dir on test tearDown()
  Fix tests
  Remove content-type check on toArray methods

v2.2.0

[DependencyInjection] Add the Required attribute.

v1.1.10

stop using deprecated PHPUnit APIs

v2.1.3: Merge branch '5.0' into 5.1

* 5.0:
  minor #37121 [Contracts] Add missing "extra.thanks" entries in composer.json (nicolas-grekas)
  [Process] Fix Permission Denied error when writing sf_proc_00 lock files on Windows
  fix handling null as empty data
  No need to create an issue when creating a PR
  Use ">=" for the "php" requirement
  [HttpClient] Fix promise behavior in HttplugClient
  [Console] Fixes question input encoding on Windows

v1.1.9: minor #37121 [Contracts] Add missing "extra.thanks" entries in compos…

…er.json (nicolas-grekas)

This PR was merged into the 5.2-dev branch.

Discussion
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[Contracts] Add missing "extra.thanks" entries in composer.json

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Something we forgot and that might help give some more visibility to symfony/contracts.

Commits
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bd04f0cce6 [Contracts] Add missing "extra.thanks" entries in composer.json