chore: add disclaimer to pr template (#1351)

Author: dreamorosi

.github/PULL_REQUEST_TEMPLATE.md

@@ -49,3 +49,5 @@
 ---
 
 By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.
+
+**Disclaimer**: We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.