Merge branch '6.4' into 7.3

* 6.4: Fix ord()-related PHP 8.5 deprecations [FrameworkBundle] Perform-no-deep-merging on workflow transitions' from/to configs [HttpKernel] Refine Vary header check to skip special handling of 'Accept-Language' when it's the only entry and '_vary_by_language' is `true` in `CacheAttributeListener`

Author: nicolas-grekas

BinaryFileResponse.php

@@ -164,7 +164,7 @@ public function setContentDisposition(string $disposition, string $filename = ''
  for ($i = 0, $filenameLength = mb_strlen($filename, $encoding); $i < $filenameLength; ++$i) {
  $char = mb_substr($filename, $i, 1, $encoding);
 
- if ('%' === $char || \ord($char) < 32 || \ord($char) > 126) {
+ if ('%' === $char || \ord($char[0]) < 32 || \ord($char[0]) > 126) {
  $filenameFallback .= '_';
  } else {
  $filenameFallback .= $char;