Merge branch '5.4' into 6.0

* 5.4:
  [DoctrineBridge] Fix compatibility with doctrine/orm 3 in Id generators
  Bump Symfony version to 5.4.5
  Update VERSION for 5.4.4
  Update CHANGELOG for 5.4.4
  Update VERSION for 5.3.15
  Update CHANGELOG for 5.3.15
  Remove 5.3 from PR template
  Bump Symfony version to 4.4.38
  Update VERSION for 4.4.37
  Update CONTRIBUTORS for 4.4.37
  Update CHANGELOG for 4.4.37
  [Process] Update PHPDoc to use proper placeholder syntax
  Fixed functional testing description

Author: derrabus

Process.php

@@ -176,7 +176,7 @@ public function __construct(array $command, string $cwd = null, array $env = nul
      * In order to inject dynamic values into command-lines, we strongly recommend using placeholders.
      * This will save escaping values, which is not portable nor secure anyway:
      *
-     *   $process = Process::fromShellCommandline('my_command "$MY_VAR"');
+     *   $process = Process::fromShellCommandline('my_command "${:MY_VAR}"');
      *   $process->run(null, ['MY_VAR' => $theValue]);
      *
      * @param string         $command The command line to pass to the shell of the OS