Upstream deps test not testing upstream deps

[aulemahal]

Generic Issue

The latest scheduled CI for "Test Upstream Dependencies" passed. Which is suspicious as #1920 fails. When I looked at the pip list, I saw that xarray 2024.07.0 was being used. The pip install earlier in the build failed:

Collecting xarray@ git+https://github.com/pydata/xarray.git@main (from -r CI/requirements_upstream.txt (line 6))
  Cloning https://github.com/pydata/xarray.git (to revision main) to /tmp/pip-install-1dx63znp/xarray_790fcd7be3824fdbab99794a83e780d9
  Running command git clone --filter=blob:none --quiet https://github.com/pydata/xarray.git /tmp/pip-install-1dx63znp/xarray_790fcd7be3824fdbab99794a83e780d9
  Resolved https://github.com/pydata/xarray.git to commit 8db6bc9048dc639f8d33c4d4c921da0df3d14cd2
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
  Preparing metadata (pyproject.toml): started
  Preparing metadata (pyproject.toml): finished with status 'done'
Requirement already satisfied: pandas>=1.5 in /home/runner/micromamba/envs/xclim/lib/python3.10/site-packages (from flox@ git+https://github.com/xarray-contrib/flox.git@main->-r CI/requirements_upstream.txt (line 3)) (2.2.2)
Requirement already satisfied: packaging>=21.3 in /home/runner/micromamba/envs/xclim/lib/python3.10/site-packages (from flox@ git+https://github.com/xarray-contrib/flox.git@main->-r CI/requirements_upstream.txt (line 3)) (24.1)
Requirement already satisfied: numpy-groupies>=0.9.19 in /home/runner/micromamba/envs/xclim/lib/python3.10/site-packages (from flox@ git+https://github.com/xarray-contrib/flox.git@main->-r CI/requirements_upstream.txt (line 3)) (0.11.2)
Requirement already satisfied: toolz in /home/runner/micromamba/envs/xclim/lib/python3.10/site-packages (from flox@ git+https://github.com/xarray-contrib/flox.git@main->-r CI/requirements_upstream.txt (line 3)) (0.12.1)
Requirement already satisfied: scipy>=1.9 in /home/runner/micromamba/envs/xclim/lib/python3.10/site-packages (from flox@ git+https://github.com/xarray-contrib/flox.git@main->-r CI/requirements_upstream.txt (line 3)) (1.14.1)
INFO: pip is looking at multiple versions of numba to determine which version is compatible with other requirements. This could take a while.
ERROR: Ignored the following versions that require a different python version: 0.36.0 Requires-Python >=3.6,<3.10; 0.37.0 Requires-Python >=3.7,<3.10
ERROR: Could not find a version that satisfies the requirement llvmlite<0.45,>=0.44.0dev0 (from numba) (from versions: 0.2.0, 0.2.1, 0.2.2, 0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.8.0, 0.9.0, 0.10.0, 0.11.0, 0.12.0.1, 0.12.1, 0.13.0, 0.14.0, 0.15.0, 0.16.0, 0.17.0, 0.17.1, 0.18.0, 0.19.0, 0.20.0, 0.21.0, 0.22.0, 0.23.0, 0.23.2, 0.24.0, 0.25.0, 0.26.0, 0.27.0, 0.27.1, 0.28.0, 0.29.0, 0.30.0, 0.31.0, 0.32.0, 0.32.1, 0.33.0, 0.34.0, 0.35.0, 0.38.0, 0.38.1, 0.39.0, 0.39.1, 0.40.0rc1, 0.40.0, 0.40.1rc1, 0.40.1, 0.41.0rc1, 0.41.0, 0.41.1, 0.42.0rc1, 0.42.0, 0.43.0rc1, 0.43.0)
ERROR: No matching distribution found for llvmlite<0.45,>=0.44.0dev0

Not sure I fully understand the issue, but at least I see that pip raised an "ERROR" without the build failing! This might explain why we were unaware of all these xarray 2024.9 bugs!

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