fix: dependabot currently doesn't support cooldown for docker

ref: dependabot/dependabot-core#14044

Author: xmatthias

.github/dependabot.yml

@@ -1,8 +1,10 @@
 version: 2
 updates:
 - package-ecosystem: docker
-  cooldown:
-    default-days: 7
+  # Docker does not support cooldowns at the moment.
+  # https://github.com/dependabot/dependabot-core/issues/14044
+  # cooldown:
+  #   default-days: 7
   directories:
     - "/"
     - "/docker"