Enhance Dependabot configuration for Rust and Actions

Added cooldown and grouping settings for Rust and GitHub Actions dependencies.

.github/dependabot.yml

@@ -5,9 +5,30 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+    cooldown:
+      default-days: 3
+      semver-major-days: 7
+      semver-minor-days: 4
+      semver-patch-days: 3
+    groups:
+      rust-dependencies:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
+          - "minor"
+          - "patch"
 
   # Maintain GitHub Actions
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "daily"
+    groups:
+      actions:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
+          - "minor"
+          - "patch"