chore(deps): update mysql docker tag to v9

compose.yml

@@ -1,6 +1,6 @@
 services:
   app:
-    image: ghost:6.42.0-alpine
+    image: ghost:6.21.2-alpine
     environment:
       # see https://ghost.org/docs/config/#configuration-options
       database__client: mysql
@@ -51,7 +51,7 @@ services:
         - "traefik.http.middlewares.${STACK_NAME}-redirect.redirectscheme.permanent=true"
         - "backupbot.backup=true"
         - "backupbot.backup.path=/var/lib/ghost/content"
-        - "coop-cloud.${STACK_NAME}.version=1.3.0+6.42.0-alpine"
+        - "coop-cloud.${STACK_NAME}.version=1.2.0+6.21.2-alpine"
     healthcheck:
       test: ["CMD", "wget", "--header=X-Forwarded-Proto: https", "--spider", "-q", "http://localhost:2368/ghost/api/admin/site"]
       interval: 30s
@@ -60,7 +60,7 @@ services:
       start_period: 1m
  
   db:
-    image: mysql:8.0
+    image: mysql:9.7
     networks:
       - backend
     environment:
@@ -103,4 +103,4 @@ secrets:
 configs:
   ghost_entrypoint:
     name: ${STACK_NAME}_ghost_entrypoint_${GHOST_ENTRYPOINT_VERSION}
-    file: entrypoint.sh
+    file: entrypoint.sh