chore: update dependabot to weekly Sunday schedule

.github/dependabot.yml

@@ -1,21 +1,15 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-
 version: 2
 updates:
-  - package-ecosystem: "gradle" # See documentation for possible values
-    directory: "/" # Location of package manifests
+  - package-ecosystem: github-actions
+    directory: "/"
     schedule:
-      interval: "daily"
-    labels:
-      - "Dependencies"
-    commit-message:
-      prefix: "feat"
-  - package-ecosystem: "github-actions"
-    directory: "/" # Location of package manifests
-    schedule:
-      interval: "weekly"
-    commit-message:
-      prefix: "feat"
+      interval: weekly
+      day: sunday
+      time: '22:00'
+      timezone: Etc/UTC
+    open-pull-requests-limit: 5
+    groups:
+      minor-and-patch:
+        update-types:
+          - minor
+          - patch

changelog/unreleased/4849

@@ -0,0 +1,5 @@
+Change: Weekly dependabot updates
+
+Dependabot workflow in GitHub Actions has been modified to be triggered weekly with maximum 5 PRs to be created
+
+https://github.com/owncloud/android/pull/4849