Let conda-build handle python variants

So far, we used to explicitly set the target python version to build for packages listed in python.txt at bob/bob.conda>. With this MR, this is deprecated - adding support for newer versions of Python gets less messy this way.

added 1 commit

• d3f96a02 - [scripts.ci] Remove unneeded import

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@amohammadi: here you'll find the changes I intend to merge.

LGTM

merged

mentioned in commit e8029310

This will not work with the package existence checks, internally...