Upstream CI broken since Oct 14

[kmuehlbauer]

What is your issue?

See https://github.com/pydata/xarray/actions/runs/18481496300/job/52656921560

ModuleNotFoundError: No module named 'google_crc32c'
Error: Process completed with exit code 1.

[keewis]

google_crc32c is a new zarr dependency, so we need to change

xarray/ci/install-upstream-wheels.sh

Line 41 in 94798a0

python -m pip install --upgrade pint donfig crc32c

to install google_crc32c instead of crc32c.