chore: bump to v7.8.1

Author: tuunit

helm/oauth2-proxy/Chart.yaml

@@ -38,4 +38,4 @@ annotations:
       description: update oauth2-proxy to v7.8.1
       links:
         - name: Github PR
-          url: https://github.com/oauth2-proxy/manifests/pull/277
+          url: https://github.com/oauth2-proxy/manifests/pull/278