Fixed the changelog for artifacthub.io

Author: pierluigilenoci

helm/oauth2-proxy/Chart.yaml

@@ -40,4 +40,4 @@ annotations:
         - name: Github Issue
           url: https://github.com/oauth2-proxy/manifests/issues/155
         - name: Github PR
-          url: https://github.com/oauth2-proxy/manifests/pull/156
+          url: https://github.com/oauth2-proxy/manifests/pull/157