docs: fix link (#1287)

Author: alexander-akait

README.md

@@ -894,7 +894,7 @@ Checkout [test/sourceMap](https://github.com/webpack/sass-loader/tree/main/test)
 We welcome all contributions!
 If you're new here, please take a moment to review our contributing guidelines before submitting issues or pull requests.
 
-[CONTRIBUTING](./.github/CONTRIBUTING.md)
+[CONTRIBUTING](https://github.com/webpack/sass-loader?tab=contributing-ov-file#contributing)
 
 ## License