Updates ingress-nginx chart to 4.8.1

Author: jupyterhub-bot

mybinder/Chart.yaml

@@ -20,7 +20,7 @@ dependencies:
   # NOTE: chart v3.36.0 maps to v0.49.0 and has support for networking.k8s.io/v1
   #       chart v4.1.2 maps to v1.2.0 and has dropped support for networking.k8s.io/v1beta1
   - name: ingress-nginx
-    version: "4.8.0"
+    version: "4.8.1"
     repository: https://kubernetes.github.io/ingress-nginx
     condition: ingress-nginx.enabled