docs(contributing): remove hacktoberfest notice (#4686)

Co-authored-by: Alexandr Garbuzov <qwerty541zxc@gmail.com>

Author: opheliagoldstein

CONTRIBUTING.md

@@ -1,8 +1,5 @@
 # Contributing to [github-readme-stats](https://github.com/anuraghazra/github-readme-stats)
 
-> [!IMPORTANT]
-> Please note that we are NOT participating in Hacktoberfest this year. As a small team, we cannot handle the increased volume of PRs and issues that the event brings. We appreciate your understanding.
-
 We love your input! We want to make contributing to this project as easy and transparent as possible, whether it's:
 
 -   Reporting [an issue](https://github.com/anuraghazra/github-readme-stats/issues/new?assignees=&labels=bug&template=bug_report.yml).