Add a documentation note about pip-system-certs #2136

Job	Run time
Documentation Style Check	11s
Code style	2m 54s
Documentation build	1m 41s
Update CHANGELOG for new tag	0s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.10)	18s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.11)	17s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.12)	25s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.13)	25s
Build wheelhouse for latest Python versions (windows-latest, 3.10)	1m 32s
Build wheelhouse for latest Python versions (windows-latest, 3.11)	1m 42s
Build wheelhouse for latest Python versions (windows-latest, 3.12)	1m 38s
Build wheelhouse for latest Python versions (windows-latest, 3.13)	2m 31s
Unit test on supported platforms (3.10)	6m 44s
Unit test on supported platforms (3.11)	6m 45s
Unit test on supported platforms (3.12)	6m 47s
Unit test on supported platforms (3.13)	6m 53s
Build library	15s
Deploy development documentation	0s
Release	0s
Deploy stable documentation	0s
	40m 58s

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