CI: unpin numpy and matplotlib #35779
- [x] closes #35779


```
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Warning in /home/runner/work/pandas/pandas/doc/source/user_guide/visualization.rst at block ending on line 764
Specify :okwarning: as an option in the ipython:: block to suppress this message
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/home/runner/work/pandas/pandas/pandas/plotting/_matplotlib/core.py:1547: MatplotlibDeprecationWarning: normalize=None does not normalize if the sum is less than 1 but this behavior is deprecated since 3.3 until two minor releases later. After the deprecation period the default value will be normalize=True. To prevent normalization pass normalize=False 
  results = ax.pie(y, labels=blabels, **kwds)
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``` thanks @VirosaLi 