Merge branch '6.4' into 7.0

* 6.4:
  [Process] remove fixing of legacy bug, when PTS functionality is enabled
  DX: re-apply self_accessor and phpdoc_types_order by PHP CS Fixer
  [HttpClient] Psr18Client: parse HTTP Reason Phrase for Response
  fix test
  Fix wrong yaml parse null test
  [AssetMapper] Fixing merge from multiple PR's
  Bump Symfony version to 5.4.31
  Update VERSION for 5.4.30
  Update CONTRIBUTORS for 5.4.30
  Update CHANGELOG for 5.4.30
  Fix wrong merge
  [AssetMapper] Allowing circular references in JavaScriptImportPathCompiler
  [AssetMapper] Fix file deleting errors & remove nullable MappedAsset on JS import
  [Lock] Fix mongodb extension requirement in tests
  [Yaml] Remove dead code
  [AssetMapper] Fix in-file imports to resolve via filesystem
  throw better exception in TranslatableNormalizer, add to changelog
  Passing null to Inline::parse is not allowed
  Fix passing null to trim()

Author: nicolas-grekas

Process.php

@@ -327,10 +327,6 @@ public function start(callable $callback = null, array $env = []): void
             // See https://unix.stackexchange.com/questions/71205/background-process-pipe-input
             $commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
             $commandline .= 'pid=$!; echo $pid >&3; wait $pid 2>/dev/null; code=$?; echo $code >&3; exit $code';
-
-            // Workaround for the bug, when PTS functionality is enabled.
-            // @see : https://bugs.php.net/69442
-            $ptsWorkaround = fopen(__FILE__, 'r');
         }
 
         $envPairs = [];