ci(dependabot): add composer updates for stable branches

.github/dependabot.yml

@@ -86,3 +86,60 @@ updates:
       - dependency-name: "*"
         update-types: ["version-update:semver-major", "version-update:semver-minor"]
 
+
+  # Main stable34 composer
+  - package-ecosystem: composer
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: saturday
+      time: "03:00"
+      timezone: Europe/Paris
+    cooldown:
+      default-days: 10
+    target-branch: stable34
+    labels:
+      - "3. to review"
+      - "dependencies"
+    ignore:
+      # do not do breaking changes on stable branches
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major", "version-update:semver-minor"]
+
+  # Main stable33 composer
+  - package-ecosystem: composer
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: saturday
+      time: "03:00"
+      timezone: Europe/Paris
+    cooldown:
+      default-days: 10
+    target-branch: stable33
+    labels:
+      - "3. to review"
+      - "dependencies"
+    ignore:
+      # do not do breaking changes on stable branches
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major", "version-update:semver-minor"]
+
+  # Main stable32 composer
+  - package-ecosystem: composer
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: saturday
+      time: "03:00"
+      timezone: Europe/Paris
+    cooldown:
+      default-days: 10
+    target-branch: stable32
+    labels:
+      - "3. to review"
+      - "dependencies"
+    ignore:
+      # do not do breaking changes on stable branches
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major", "version-update:semver-minor"]