Update debian/changelog, version file, and release-notes/3.8.4.md for 3.8.4 release

Author: hubot

debian/changelog

@@ -1,3 +1,11 @@
+github-backup-utils (3.8.4) UNRELEASED; urgency=medium
+
+ ### Bug Fixes
+
+* On an instance with Actions enabled, incorrect backup and restore settings prevented the storage container name from being restored. This made the logs from that container inaccessible, and caused Actions to create a new storage container in a different location. 
+
+ -- ghes-releases-team  Wed, 01 Nov 2023 14:28:25 +0000
+
 github-backup-utils (3.8.4) UNRELEASED; urgency=medium
 
   * On an instance with Actions enabled, incorrect backup and restore settings prevented the storage container name from being restored. This made the logs from that container inaccessible, and caused Actions to create a new storage container in a different location.