Update README.md, remove content related to Hacktoberfest 2022 (#29358)

README.md

@@ -58,13 +58,6 @@ For full documentation & more details, visit: [Docs](https://shardingsphere.apac
 
 For guides on how to get started and setup your environment, contributor & committer guides, visit: [Contribution Guidelines](https://shardingsphere.apache.org/community/en/involved/)
 
-Good news! We'll be taking part in [Hacktoberfest 2022](https://hacktoberfest.com) 🍻🎉 Hacktoberfest is for everyone. 
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-Whether it's your first time, you're a seasoned PRO - it's almost time to get hacking, chase those pull/merge requests and complete your mission in supporting open source.
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-You can find the issues we've prepared for this year's Hacktoberfest [here](https://github.com/apache/shardingsphere/issues?q=is%3Aopen+is%3Aissue+label%3Ahacktoberfest).
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 ### Team
 
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