Merge pull request #164 from fluent/dependabot.yml

CI: add dependabot.yml

Author: kenhys

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'monthly'