MAINT: rename piqtree2 to piqtree #433

Job	Run time
Fetch or Build IQ-TREE 2 Static Library on ubuntu-latest	5m 18s
Fetch or Build IQ-TREE 2 Static Library on macos-13	5m 21s
Fetch or Build IQ-TREE 2 Static Library on macos-14	3m 51s
Type Check (3.12, ubuntu-latest)	48s
Run Tests with Python 3.10 on ubuntu-latest	1m 38s
Linting (3.12, ubuntu-latest)	39s
Run Tests with Python 3.11 on ubuntu-latest	1m 30s
Run Tests with Python 3.12 on ubuntu-latest	1m 38s
Run Tests with Python 3.10 on macos-13	3m 46s
Run Tests with Python 3.11 on macos-13	3m 13s
Run Tests with Python 3.12 on macos-13	3m 22s
Run Tests with Python 3.10 on macos-14	3m 32s
Run Tests with Python 3.11 on macos-14	2m 55s
Run Tests with Python 3.12 on macos-14	1m 51s
Finish Coveralls	5s
	39m 27s

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