Generally, we tend to test with quite old python versions. For the core tests like the test-conda-python-xx builds, we test on the full range of supported python versions (3.7-3.11). But for some other custom integrations tests, we test mostly with old versions:

Pandas doesn't actually support python 3.7 anymore, so because we use that version for the "latest" build, we don't actually get latest pandas.

Also for example the HDFS tests are using python 3.7