SSL error when having https enabled with manual certificates in jupyterhub side.

Dear,
We have a daskhub server on a supercomputer in our lab. We are based on the latest helm chart ( daskhub-2022.6.0 version 2022.6.1)
https on jupyterhub is enabled through manual certificate and it seems dask cannot success to communicate together.

config :
```
jupyterhub:
hub:
services:
dask-gateway:
apiToken: secret1
proxy:
https:
enabled: true
hosts:
- 10.86.1.95
type: secret
secret:
name: example-tls
traefik:
networkPolicy:
enabled: False

dask-gateway:
gateway:
auth:
jupyterhub:
apiToken: secret1

```
Now when I try to create a dask cluster in my jupyterhub session, I am having a ssl error.
```python
from dask_gateway import Gateway
gateway = Gateway()
cluster = gateway.new_cluster()
```

Error:
```
ClientConnectorCertificateError: Cannot connect to host proxy-public:443 ssl:True [SSLCertVerificationError: (1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)')]
```

Note that if I deactivate https in jupyterhub and work only with http everything is running correctly. So, I think there is a bug somewhere when using manual authentification.

Any idea for me ? Thanks