chore: Add Dependabot version-update cooldown

Author: ld-repository-standards[bot]

.github/dependabot.yml

@@ -4,8 +4,17 @@ updates:
     directory: '/'
     schedule:
       interval: 'weekly'
-
+    cooldown:
+      default-days: 7
   - package-ecosystem: 'gomod'
     directory: '/'
     schedule:
       interval: 'weekly'
+    cooldown:
+      default-days: 7
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7