Merge branch '6.4' into 7.3

* 6.4:
  use false instead of null to hide the currency symbol
  [FrameworkBundle] Fix block type from `OK` to `ERROR` when local vault is disabled in `SecretsRemoveCommand`
  Fix wrong boolean values
  [Messenger] Fix NoAutoAckStamp handling in Worker::flush()

Author: nicolas-grekas

Command/SecretsRemoveCommand.php

@@ -59,7 +59,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $vault = $input->getOption('local') ? $this->localVault : $this->vault;
 
         if (null === $vault) {
-            $io->success('The local vault is disabled.');
+            $io->error('The local vault is disabled.');
 
             return 1;
         }