Merge branch '6.4' into 7.0

* 6.4:
  Remove 6.3 EOLed from Github template
  [Mailer] [Mailgun] Fix payload converter getReason
  [HttpFoundation] Fix clearing CHIPS cookies
  [AssetMapper] Turn debug on by default
  [AssetMapper] Fix JavaScript compiler load imports from JS strings
  [Notifier][Smsapi] Better docs for .com endpoint
  Fix exception if assets dir is missing in prod
  Update VERSION for 6.3.12
  Update CHANGELOG for 6.3.12
  Bump Symfony version to 5.4.36
  Update VERSION for 5.4.35
  Update CONTRIBUTORS for 5.4.35
  Update CHANGELOG for 5.4.35

Author: derrabus

Resources/config/asset_mapper.php

@@ -75,6 +75,7 @@
                 param('kernel.project_dir'),
                 abstract_arg('array of excluded path patterns'),
                 abstract_arg('exclude dot files'),
+                param('kernel.debug'),
             ])
 
         ->set('asset_mapper.public_assets_path_resolver', PublicAssetsPathResolver::class)