TST: reduce testing burden #168

Job	Run time
Fetch or Build IQ-TREE 2 Static Library on ubuntu-latest	12s
Fetch or Build IQ-TREE 2 Static Library on macos-13	19s
Fetch or Build IQ-TREE 2 Static Library on macos-14	15s
Run Tests with Python 3.9 on ubuntu-latest	1m 26s
Run Tests with Python 3.10 on ubuntu-latest	1m 25s
Run Tests with Python 3.11 on ubuntu-latest	1m 43s
Run Tests with Python 3.12 on ubuntu-latest	1m 49s
Run Tests with Python 3.9 on macos-13	2m 23s
Run Tests with Python 3.10 on macos-13	2m 14s
Run Tests with Python 3.11 on macos-13	2m 17s
Run Tests with Python 3.12 on macos-13	2m 8s
Run Tests with Python 3.9 on macos-14	2m 5s
Run Tests with Python 3.10 on macos-14	2m 29s
Run Tests with Python 3.11 on macos-14	2m 25s
Run Tests with Python 3.12 on macos-14	2m 15s
Finish Coveralls	3s
	25m 28s

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