downgrade conda #368

Job	Run time
test_code_conda	3m 38s
pre-commit	3m 14s
test_code_coverage	7m 12s
Test femwell on ubuntu-latest	1m 47s
test_docs	31m 25s
Test gmsh on ubuntu-latest	2m 16s
Test elmer on ubuntu-latest	2m 24s
Test meow on ubuntu-latest	3m 8s
Test sax on ubuntu-latest	2m 10s
Test tidy3d on ubuntu-latest	1m 55s
Test klayout on ubuntu-latest	1m 25s
Test vlsir on ubuntu-latest	2m 9s
	1h 2m 43s

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