docs: update python docs link in readme.md #4788

Job	Run time
Python Benchmark	3m 45s
lint	2m 37s
Running with Python 3.8	3m 45s
Running with Python 3.9	3m 53s
Python Build (Python 3.10 PyArrow latest)	4m 6s
Running with Python 3.10	3m 47s
Python Build (Python 3.8 PyArrow 8.0.0)	2m 33s
Running with Python 3.11	3m 50s
Running with Python 3.12	3m 57s
PySpark Integration Tests	2m 28s
	34m 41s

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