Update GitHub Actions with Dependabot

Signed-off-by: Sora Morimoto <[email protected]>

Author: smorimoto

.github/dependabot.yml

@@ -1,7 +1,10 @@
 version: 2
 updates:
-  - package-ecosystem: "npm"
-    directory: "/"
-    open-pull-requests-limit: 100
+  - package-ecosystem: github-actions
+    directory: /
     schedule:
-      interval: "daily"
+      interval: weekly
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: daily