chore(branchoff): Run dependabot on stable30

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/dependabot.yml

@@ -32,6 +32,22 @@ updates:
     - dependency-name: "symfony/translation"
       versions: [ "6.x" ]
 
+- package-ecosystem: composer
+  directory: "/"
+  target-branch: stable30
+  schedule:
+    interval: weekly
+    day: saturday
+    time: "03:00"
+    timezone: Europe/Paris
+  open-pull-requests-limit: 10
+  ignore:
+    - dependency-name: "*"
+      update-types: ["version-update:semver-major", "version-update:semver-minor"]
+  labels:
+    - "dependencies"
+    - "stable30"
+
 - package-ecosystem: composer
   directory: "/"
   target-branch: stable29