Update dependabot.yml (#4978)

.github/dependabot.yml

@@ -1,29 +1,5 @@
 version: 2
 updates:
-  # for master branch
-  - package-ecosystem: npm
-    directory: "/"
-    schedule:
-      interval: weekly
-      day: monday
-      time: "03:00"
-    open-pull-requests-limit: 10
-    target-branch: "master"
-    labels:
-      - dependencies
-      - version:3.1.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
   - package-ecosystem: npm
     directory: "/"
@@ -38,3 +14,11 @@ updates:
       - version:4.x
     versioning-strategy: increase
     rebase-strategy: disabled
+
+  # for github actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: tuesday
+      time: "03:00"