chore: add dependabot.yml

see https://docs.github.com/en/github/administering-a-repository/keeping-your-dependencies-updated-automatically

.github/dependabot.yml

@@ -0,0 +1,14 @@
+# see https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  # Maintain dependencies for npm
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "daily"