jmp: typo in namespace while run config client create

I've observed a typo when run: `jmp config client create <alias>`
ref: [config_client.py](https://github.com/jumpstarter-dev/jumpstarter/blob/main/python/packages/jumpstarter-cli/jumpstarter_cli/config_client.py#L38C46-L38C53)


```
❯ jmp config client create $USER
Enter a valid Jumpstarter client nespace:
```