Group dependabot updates

Author: jasonlong

.github/dependabot.yml

@@ -3,4 +3,19 @@ updates:
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "weekly"
+      day: "monday"
+    groups:
+      astro:
+        patterns:
+          - "@astrojs/*"
+          - "astro"
+      eslint:
+        patterns:
+          - "@typescript-eslint/*"
+          - "eslint-*"
+          - "eslint"
+      prettier:
+        patterns:
+          - "prettier-plugin-*"
+          - "prettier"