Update rock tag for new builds with updated percona packages (#594)

Author: shayancanonical

metadata.yaml

@@ -32,7 +32,7 @@ resources:
   mysql-image:
     type: oci-image
     description: Ubuntu LTS Docker image for MySQL
-    upstream-source: ghcr.io/canonical/charmed-mysql@sha256:5d2dcca486b8710720590c57bf97cc49ab79b1a739d6f482310c9aa962a14455
+    upstream-source: ghcr.io/canonical/charmed-mysql@sha256:089fc04dd2d6f1559161ddf4720c1e06559aeb731ecae57b050c9c816e9833e9
 
 peers:
   database-peers: