chore: Add cooldown of dependabot PR (#1317)

## Summary by Sourcery

Enhancements:
- Configure Dependabot to enforce a 7-day cooldown between PRs.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Introduced a 7-day cooldown to the automated dependency update
schedule, smoothing weekly checks and reducing pull request churn.
* Added related project entries to track the cooldown and update flow
for maintainers.
* No changes to product functionality or user experience; maintenance
activity will be more predictable and less noisy.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: Czaki

.github/dependabot.yml

@@ -4,6 +4,8 @@ updates:
     directory: ""
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
 
     target-branch: "develop"
     groups:

.github/project_dict.pws

@@ -21,3 +21,6 @@ deprecations
 github
 deps
 sdk
+PR
+dependabot
+cooldown