chore: fix pubspec repo, issue urls

Author: cybex-dev

Diff for: pubspec.yaml

@@ -2,8 +2,8 @@ name: cooler_alerts
 description: A Flutter package to display animated alert dialogs, replacement for cool_alert.
 version: 2.1.1
 homepage: https://cooler-alerts.web.app/
-repository: https://github.com/cybex-dev/cooler_alert.git
-issue_tracker: https://github.com/cybex-dev/cooler_alert/issues
+repository: https://github.com/cybex-dev/cooler_alerts.git
+issue_tracker: https://github.com/cybex-dev/cooler_alerts/issues
 topics:
   - flutter
   - alert