ci: Build wheels first in development version tests

[garrison]

This is an experiment to build wheels first, then run tox in parallel.

[coveralls]

Pull Request Test Coverage Report for Build 10840695662

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 10832955808:	0.0%
Covered Lines:	297
Relevant Lines:	297

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💛 - Coveralls

[garrison]

I like this a lot, the way it turned out. It's a lot more transparent than just letting tox handle everything, and it enables parallelization.

[mrossinek]

I originally refrained from doing this as I did not want to make any assumptions around the build process. But I suppose the build tools have come a long way where this seems straight forward and transferable enough 👍