Build

Backport: Non-hardcoded python version (#177) #570

Job	Run time
Check Links	52s
Check Links	52s
build	2m 33s
build	2m 33s
python-tests-mamba-python	2m 13s
python-tests-mamba-python	2m 13s
python-tests-conda	2m 22s
python-tests-conda	2m 22s
python-tests-mamba	2m 31s
python-tests-mamba	2m 31s
Integration tests (jupyterlite-core -U, default)	4m 6s
Integration tests (jupyterlite-core -U, default)	4m 6s
python-tests-micromamba	36s
python-tests-micromamba	1m 58s
test_isolated	35s
test_isolated	35s
Integration tests (jupyterlite-core -U --pre, default)	3m 37s
Integration tests (jupyterlite-core -U --pre, default)	3m 37s
Integration tests (jupyterlite-core -U --pre, crossoriginisolated)	3m 38s
Integration tests (jupyterlite-core -U --pre, crossoriginisolated)	3m 38s
	47m 28s

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