Bump version: 3.9.0 [ci skip]

Author: JoeFranks1993

debian/changelog

@@ -1,3 +1,12 @@
+github-backup-utils (3.9.0) UNRELEASED; urgency=medium
+
+  * Switch to TMPDIR before initiating SSH multiplexing workaround to prevent locking the destination filesystem #348
+  * Cleanup SSH multiplexing on exit #363
+  * Allow extra rsync options to override default options #370
+  * Retry with the admin ssh port on network unreachable too. #377
+
+ -- Joseph Franks <[email protected]>  Thu, 29 Jun 2023 22:36:16 +0000
+
 github-backup-utils (3.9.0) UNRELEASED; urgency=medium
 
   * Set restore status on all cluster nodes #274