README: minimum Python version is 3.10

[Frenzie]

cd server && make install
make[1]: Entering directory '/data/tmp/text-generation-inference/server'
# Compile protos
pip install -U pip uv
Requirement already satisfied: pip in /data/tmp/text-generation-inference/.venv/lib/python3.9/site-packages (25.0.1)
Requirement already satisfied: uv in /data/tmp/text-generation-inference/.venv/lib/python3.9/site-packages (0.6.16)
uv pip install -r requirements_gen.txt
Using Python 3.9.2 environment at: /data/tmp/text-generation-inference/.venv
  × No solution found when resolving dependencies:
  ╰─▶ Because the current Python version (3.9.2) does not satisfy Python>=3.10 and numpy==2.2.2 depends on Python>=3.10, we can conclude that numpy==2.2.2 cannot be used.
      And because you require numpy==2.2.2, we can conclude that your requirements are unsatisfiable.
make[1]: *** [Makefile:19: gen-server] Error 1
make[1]: Leaving directory '/data/tmp/text-generation-inference/server'
make: *** [Makefile:2: install-server] Error 2

What does this PR do?

Fixes # (issue)

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