Add dependabot

Author: oleksandr-pavlyk

.github/dependabot.yml

@@ -1,14 +1,6 @@
 version: 2
 updates:
-- package-ecosystem: npm
-  directory: "/"
-  schedule:
-    interval: daily
-    time: '20:00'
-  open-pull-requests-limit: 10
-- package-ecosystem: bundler
-  directory: "/"
-  schedule:
-    interval: daily
-    time: '20:00'
-  open-pull-requests-limit: 10
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"