chore: fix 404 status URL (#2635)

Signed-off-by: linchizhen <[email protected]>

Author: linchizhen

contributing.md

@@ -6,7 +6,7 @@ What follows is a set of guidelines (not rules) for contributing to SubQuery. Fo
 
 ## Code of Conduct
 
-We take our open source community projects and responsibility seriously and hold ourselves and other contributors to high standards of communication. By participating and contributing to this project, you agree to uphold our [Code of Conduct](https://github.com/subquery/subql/blob/contributors-guide/CODE_OF_CONDUCT.md).
+We take our open source community projects and responsibility seriously and hold ourselves and other contributors to high standards of communication. By participating and contributing to this project, you agree to uphold our [Code of Conduct](https://github.com/subquery/subql/blob/main/CODE_OF_CONDUCT.md).
 
 ## Getting started