Fix the jupyter hub helm chart version to avoid using the latest one which introduce error whan spawn a server

[gongmax]

Jupyterhub helm chart has a new release on 11/07. After than, all rag e2e tests started failing, which are caused by the below jupyterhub spawner error

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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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File "/usr/local/lib/python3.11/site-packages/kubespawner/spawner.py", line 1847, in <dictcomp>
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return {k: self._expand_all(v) for k, v in src.items()}
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^^^^^^^^^^^^^^^^^^^
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File "/usr/local/lib/python3.11/site-packages/kubespawner/spawner.py", line 1849, in _expand_all
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return self._expand_user_properties(src)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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File "/usr/local/lib/python3.11/site-packages/kubespawner/spawner.py", line 1827, in _expand_user_properties
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rendered = template.format(
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^^^^^^^^^^^^^^^^
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    KeyError: 'user_server'

Without root cause the issue, this PR change it to use a fixed jupyterhub helm chart version to mitigate

[gongmax]

/gcbrun