Updates: (deps): Update drupal/ajax_comments requirement

Updates the requirements on drupal/ajax_comments to permit the latest version.

---
updated-dependencies:
- dependency-name: drupal/ajax_comments
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -119,7 +119,7 @@
         "drupal/address": "^1.12.0 || ^2.0.1",
         "drupal/admin_toolbar": "3.5.0",
         "drupal/advancedqueue": "1.2.0",
-        "drupal/ajax_comments": "1.0.0-beta5",
+        "drupal/ajax_comments": "1.0.0-beta6",
         "drupal/better_exposed_filters": "7.0.2",
         "drupal/block_field": "1.0.0-rc5",
         "drupal/ckeditor": "1.0.2",