ci: revert testing workflow to use conda #169

Job	Run time
Continuous integration windows-latest python 3.12	14m 50s
Continuous integration ubuntu-latest python 3.12	7m 51s
Continuous integration windows-latest python 3.10	13m 34s
Continuous integration ubuntu-latest python 3.11	7m 42s
Continuous integration ubuntu-latest python 3.10	7m 47s
Continuous integration macos-latest python 3.12	9m 19s
Continuous integration macos-latest python 3.11	8m 47s
Continuous integration windows-latest python 3.11	13m 54s
Continuous integration macos-latest python 3.10	10m 20s
	1h 34m 4s

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