chore: add dependabot cooldown

Author: Kornel-Toth

.github/dependabot.yml

@@ -4,21 +4,26 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 4
     pull-request-branch-name:
       separator: "-"
   - package-ecosystem: "pip"
     directory: "/"
     open-pull-requests-limit: 10
     schedule:
       interval: "daily"
+    cooldown:
+      default-days: 4
     pull-request-branch-name:
       separator: "-"
 # Custom settings
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 4
     target-branch: "gh-pages"
     pull-request-branch-name:
       separator: "-"
-