ci: add Dependabot config with grouped updates (#444)

Author: josephfusco

.github/dependabot.yml

@@ -0,0 +1,28 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      all-minor-patch:
+        patterns: ["*"]
+        update-types: [minor, patch]
+
+  - package-ecosystem: composer
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      all-minor-patch:
+        patterns: ["*"]
+        update-types: [minor, patch]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      all-minor-patch:
+        patterns: ["*"]
+        update-types: [minor, patch]