Revert "Update numpy to 2.1.2 and pandas to 2.2.3"

[frenck]

Reverts #129958

Breaks our CI: https://github.com/home-assistant/core/actions/runs/11716301319/job/32634642240?pr=130005

Causes:

$ uv pip install -r requirements_all.txt
...
 - numpy==1.26.4
 + numpy==2.1.2
...
$ pytest tests/components/weatherflow
E   AttributeError: module 'numpy' has no attribute 'cumproduct'. Did you mean: 'cumprod'?

Origin: hgrecco/pint#1969

/CC @cdce8p

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[epenet]

I think this PR is not needed.
The issue comes from the release of flexparser==0.4 https://pypi.org/project/flexparser/#history
I have created a separate PR to fix the CI: #130016