ci: add Dependabot config with grouped updates

Author: josephfusco

.github/dependabot.yml

@@ -0,0 +1,32 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      wordpress-scripts-tree:
+        patterns:
+          - "@wordpress/*"
+          - "webpack*"
+          - "lodash*"
+          - "picomatch"
+          - "@tootallnate/*"
+      npm-minor-patch:
+        update-types: [minor, patch]
+
+  - package-ecosystem: composer
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      composer-minor-patch:
+        update-types: [minor, patch]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      actions:
+        patterns: ["*"]