docs: update a URL to contributing guidelines markdown file in feature request issue template (#3370)

Co-authored-by: Zack Jackson <[email protected]>

Author: NikaBuligini

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -36,7 +36,7 @@ body:
       label: Validations
       description: Before submitting the issue, please make sure you do the following
       options:
-        - label: Read the [Contributing Guidelines](https://github.com/module-federation/core/blob/canary/CONTRIBUTING.md).
+        - label: Read the [Contributing Guidelines](https://github.com/module-federation/core/blob/main/CONTRIBUTING.md).
           required: true
         - label: Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
           required: true