tools: Update tidy.sh and related config

Author: taiki-e

.github/dependabot.yml

@@ -1,18 +1,20 @@
 version: 2
 updates:
-  - package-ecosystem: cargo # zizmor: ignore[dependabot-cooldown] # Unless dependencies are pinned/locked, the effect is limited.
+  - package-ecosystem: cargo
     directory: /
     schedule:
-      interval: daily
+      interval: weekly
+    cooldown:
+      default-days: 14 # Note: Unless dependencies are pinned/locked, the effect is limited.
     commit-message:
       prefix: ''
     labels: []
   - package-ecosystem: github-actions
     directory: /
     schedule:
-      interval: daily
+      interval: weekly
     cooldown:
-      default-days: 7
+      default-days: 14
     commit-message:
       prefix: ''
     labels: []

.github/zizmor.yml

@@ -3,6 +3,7 @@
 
 rules:
   anonymous-definition: { disable: true }
+  dependabot-cooldown: { config: { days: 14 } }
   unpinned-uses:
     config:
       policies: