chore: fix outdated link to Code of Conduct in PR template (#15578)

Author: Trott

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,7 @@
 <!--
     Thank you for contributing!
 
-    ESLint adheres to the [JS Foundation Code of Conduct](https://js.foundation/community/code-of-conduct).
+    ESLint adheres to the [JS Foundation Code of Conduct](https://eslint.org/conduct).
 -->
 
 #### Prerequisites checklist