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

Author: nicolas-grekas

Tests/RouterTest.php

@@ -36,7 +36,7 @@ protected function tearDown(): void
     {
         if (is_dir($this->cacheDir)) {
             array_map('unlink', glob($this->cacheDir.\DIRECTORY_SEPARATOR.'*'));
-            rmdir($this->cacheDir);
+            @rmdir($this->cacheDir);
         }
 
         $this->loader = null;