chore(ci): add Dependabot and group updates for GitHub Actions (#358)

Author: zerosnacks

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore(deps)"
+    open-pull-requests-limit: 1
+    groups:
+      github-actions-weekly:
+        applies-to: "version-updates"
+        patterns: ["*"]
+        update-types: ["minor", "patch"]