Update dependabot.yml (#4978)

.github/dependabot.yml

@@ -1,40 +1,24 @@
 version: 2
 updates:
-  # for master branch
+  # for v4-dev branch
   - package-ecosystem: npm
     directory: "/"
     schedule:
       interval: weekly
-      day: monday
+      day: tuesday
       time: "03:00"
     open-pull-requests-limit: 10
-    target-branch: "master"
+    target-branch: "v4-dev"
     labels:
       - dependencies
-      - version:3.1.x
+      - version:4.x
-    versioning-strategy: increase
-    rebase-strategy: disabled
-  - package-ecosystem: bundler
-    directory: "/docs/"
-    schedule:
-      interval: weekly
-      day: monday
-      time: "03:00"
-    open-pull-requests-limit: 10
     versioning-strategy: increase
     rebase-strategy: disabled
 
-  # for v4-dev branch
+  # for github actions
-  - package-ecosystem: npm
+  - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: weekly
       day: tuesday
       time: "03:00"
-    open-pull-requests-limit: 10
-    target-branch: "v4-dev"
-    labels:
-      - dependencies
-      - version:4.x
-    versioning-strategy: increase
-    rebase-strategy: disabled