chore: group dependabot updates into single PRs per ecosystem

Agent-Logs-Url: https://github.com/go-sql-driver/mysql/sessions/4d9d4e1a-0c61-47b5-85f4-a71788a23b88

Co-authored-by: methane <199592+methane@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -9,8 +9,16 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    groups:
+      all-dependencies:
+        patterns:
+          - "*"
 
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "weekly"
+    groups:
+      all-dependencies:
+        patterns:
+          - "*"