Merge branch '6.4' into 7.0

* 6.4:
  [AssetMapper] Fixing js sourceMappingURL extraction when sourceMappingURL used in code
  [VarExporter] Deprecate per-property lazy-initializers
  [Routing] Extend old Annotations from new Attributes
  [Mailer] Update default Mailjet port
  Bump Symfony version to 6.4.0
  Update VERSION for 6.4.0-BETA3
  Update CHANGELOG for 6.4.0-BETA3

Author: nicolas-grekas

CHANGELOG.md

@@ -10,6 +10,7 @@ CHANGELOG
 ---
 
  * Add DSN parameter `peer_fingerprint` to verify TLS certificate fingerprint
+ * Change the default port for the `mailjet+smtp` transport from 465 to 587
 
 6.3
 ---