chore: PR template

Co-Authored-By: Classic298 <27028174+Classic298@users.noreply.github.com>

.github/pull_request_template.md

@@ -73,4 +73,4 @@
 
 ### Contributor License Agreement
 
-By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms.
+By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms.