chore: update dependabot config for full coverage, weekly schedule, 7-day cooldown, and grouped updates

Author: dguido

.github/dependabot.yml

@@ -3,11 +3,21 @@ updates:
   - package-ecosystem: pip
     directory: "/"
     schedule:
-      interval: daily
-      time: "10:00"
+      interval: "weekly"
     open-pull-requests-limit: 10
+    cooldown:
+      default-days: 7
+    groups:
+      pip-dependencies:
+        patterns:
+          - "*"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      # Check for updates to GitHub Actions every weekday
-      interval: "daily"
+      interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      github-actions-dependencies:
+        patterns:
+          - "*"