housekeeping: Configure cooldown for Docker dependency updates

Added cooldown settings for Docker dependencies.

.github/dependabot.yml

@@ -9,6 +9,13 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+    cooldown:
+      default-days: 1        # fallback for anything not covered below
+      semver-major-days: 7
+      semver-minor-days: 3
+      semver-patch-days: 1
+      include:
+        - "*"
   - package-ecosystem: "npm"
     directory: "/"
     schedule: