Pin pandas
version for Python 3.9 in optional requirements for tests
#5219
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For context: pandas-dev/pandas#61563 (comment)
TL;DR Pandas intended to drop support for Python 3.9 in the Pandas 2.3.0 release, and therefore didn’t upload pre-compiled wheels for Python 3.9; however, they forgot to update requires-python in the pyproject.toml, so
uv
still tries to install it and has to compile from scratch since the wheel isn’t available, which fails.This fixes the failing Python 3.9 CI jobs on
main
.