chore: harden grouped dependency updates

Author: JerrettDavis

.github/dependabot.yml

@@ -1,10 +1,41 @@
-version: 2
-updates:
-  - package-ecosystem: "nuget"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "weekly"
+# Keep dependency PRs grouped and delayed for at least 48 hours so newly published packages age before adoption.
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+      timezone: "America/Chicago"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "ci"
+    commit-message:
+      prefix: "chore(deps)"
+    cooldown:
+      default-days: 2
+    groups:
+      github-actions-dependencies:
+        patterns:
+          - "*"
+
+  - package-ecosystem: "nuget"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+      timezone: "America/Chicago"
+    open-pull-requests-limit: 10
+    labels:
+      - "dependencies"
+    commit-message:
+      prefix: "chore(deps)"
+    cooldown:
+      default-days: 2
+    groups:
+      nuget-dependencies:
+        patterns:
+          - "*"