Add dependabot config (#90)

.github/dependabot.yml

@@ -0,0 +1,33 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: wednesday
+      time: "00:00"
+
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+      day: wednesday
+      time: "00:00"
+
+    # Ensure the new version is stored in `package.json`
+    versioning-strategy: increase
+
+    # Update `dependencies` and `devDependencies` separately
+    # Create grouped PRs for minor/patch updates
+    # Major version updates will get individual PRs
+    groups:
+      production:
+        dependency-type: production
+        update-types:
+          - patch
+          - minor
+      development:
+        dependency-type: development
+        update-types:
+          - patch
+          - minor