Add link to ty issue tracker (#17924)

Co-authored-by: Micha Reiser <micha@reiser.io>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,8 @@
 blank_issues_enabled: true
 contact_links:
+  - name: Report an issue with ty
+    url: https://github.com/astral-sh/ty/issues/new/choose
+    about: Please report issues for our type checker ty in the ty repository.
   - name: Documentation
     url: https://docs.astral.sh/ruff
     about: Please consult the documentation before creating an issue.