Merge branch '6.4' into 7.3

* 6.4:
  do not use PHPUnit mock objects without configured expectations
  [Form] Fix ICU 72+ whitespace handling in `DateTimeToLocalizedStringTransformer`
  [Process] Adjust Process mustRun method phpdoc
  [Serializer] Fix NameConverter not detecting wrong input format with allow_extra_attributes=false

Author: xabbuh

Process.php

@@ -259,7 +259,12 @@ public function run(?callable $callback = null, array $env = []): int
      *
      * @return $this
      *
-     * @throws ProcessFailedException if the process didn't terminate successfully
+     * @throws ProcessFailedException   When process didn't terminate successfully
+     * @throws RuntimeException         When process can't be launched
+     * @throws RuntimeException         When process is already running
+     * @throws ProcessTimedOutException When process timed out
+     * @throws ProcessSignaledException When process stopped after receiving signal
+     * @throws LogicException           In case a callback is provided and output has been disabled
      *
      * @final
      */