Merge branch '7.0' into 7.1

* 7.0: (39 commits)
  fix merge
  add missing return type-hints
  fix merge
  explicitly mark nullable parameters as nullable
  fix low deps tests
  [HttpKernel] Fix datacollector caster for reference object property
  [Serializer] Fixing PHP warning in the ObjectNormalizer with MaxDepth enabled
  bug #51578 [Cache] always select database for persistent redis connections
  [Security] Validate that CSRF token in form login is string similar to username/password
  [Serializer] Use explicit nullable type
  [validator] validated Dutch translation
  Improve dutch translations
  initialize the current time with midnight before modifying the date
  [Translation] Skip state=needs-translation entries only when source == target
  [HttpKernel] Ensure controllers are not lazy
  [Validator] Fill in trans-unit id 113: This URL does not contain a TLD.
  [Validator] added missing Polish translation for unit 113
  [Validator] add missing lv translation
  fix tests
  [HttpClient] Let curl handle transfer encoding
  ...

Author: xabbuh

Filesystem.php

@@ -662,7 +662,7 @@ public function dumpFile(string $filename, $content): void
                 throw new IOException(sprintf('Failed to write file "%s": ', $filename).self::$lastError, 0, null, $filename);
             }
 
-            self::box('chmod', $tmpFile, file_exists($filename) ? fileperms($filename) : 0666 & ~umask());
+            self::box('chmod', $tmpFile, @fileperms($filename) ?: 0666 & ~umask());
 
             $this->rename($tmpFile, $filename, true);
         } finally {