Merge branch '5.4' into 6.4

* 5.4:
  [Cache] Improve `dbindex` DSN parameter parsing
  Support for PHP-CS-Fixer's parallel runner
  use more entropy with uniqid()
  [Contracts][HttpClient] Skip tests when zlib's `ob_gzhandler()` doesn't exist

Tests/Mapping/Factory/ClassMetadataFactoryCompilerTest.php

@@ -27,7 +27,7 @@ final class ClassMetadataFactoryCompilerTest extends TestCase
 
     protected function setUp(): void
     {
-        $this->dumpPath = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'php_serializer_metadata.'.uniqid('CompiledClassMetadataFactory').'.php';
+        $this->dumpPath = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'php_serializer_metadata.'.uniqid('CompiledClassMetadataFactory', true).'.php';
     }
 
     protected function tearDown(): void