dependabot: increase cooldown.default-days to 7

To satisfy zizmor's now-higher threshold:
zizmorcore/zizmor#1375

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

Author: kevinoid

.github/dependabot.yml

@@ -7,10 +7,10 @@ updates:
   schedule:
     interval: "daily"
   cooldown:
-    default-days: 4
+    default-days: 7
 - package-ecosystem: "pip"
   directory: "/"
   schedule:
     interval: "daily"
   cooldown:
-    default-days: 4
+    default-days: 7