health check returns connection refused to local ipv6 address

**Describe the bug**
nginx container:
```
Connection refused) while connecting to upstream, client: x.x.x.x, server: , request: "GET /version HTTP/1.1", upstream: "http://[::1]:8000/version
```
I am not sure if the ipv6 local address is what is causing the issue or not.

**To Reproduce**
Steps to reproduce the behavior:
1. launch helm chart and view logs in
```
kubectl logs label-studio-ls-app-6df656c4f7-9tjwc --container nginx --timestamps=true -n label-studio
```

**Expected behavior**
health check should not fail.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Environment (please complete the following information):**
- OS: linux
- Label Studio Version 1.16.0

**Additional context**
Add any other context about the problem here.