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:
@@ -17,4 +24,4 @@ updates:
     open-pull-requests-limit: 30
     groups:
       dev-dependencies:
-        dependency-type: "development"
+        dependency-type: "development"