ci: add dependabot cooldown

Author: damienwebdev

.github/dependabot.yml

@@ -4,6 +4,10 @@ updates:
     directory: '/'
     schedule:
       interval: 'weekly'
+    cooldown:
+      semver-major-days: 7
+      semver-minor-days: 7
+      semver-patch-days: 3
     groups:
       npm-dependencies:
         patterns:
@@ -14,3 +18,5 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 3