fix(ci): remove unsupported cooldown config from github-actions dependabot entry

Author: vbudhram

.github/PULL_REQUEST_TEMPLATE.md

@@ -19,7 +19,6 @@ _Put an `x` in the boxes that apply_
 - [ ] I have added necessary documentation (if appropriate).
 - [ ] I have verified that my changes render correctly in RTL (if appropriate).
 - [ ] I have manually reviewed all AI generated code.
-- [ ] I have self-reviewed this PR.
 
 ## How to review (Optional)
 

.github/dependabot.yml

@@ -31,10 +31,6 @@ updates:
     directory: '/'
     schedule:
       interval: daily
-    cooldown:
-      semver-major-days: 30
-      semver-minor-days: 14
-      semver-patch-days: 7
     open-pull-requests-limit: 2
     reviewers:
       - '@mozilla/fxa-devs'