Remove `python-gil` requirement and enable free-threaded Python #6039

Job	Run time
build_linux (3.13, false)	5m 24s
build_linux (3.11, false)	5m 17s
build_linux (3.14, true)	5m 33s
build_windows (3.12, false)	11m 25s
build_linux (3.10, false)	6m 30s
build_windows (3.13, false)	10m 28s
build_linux (3.14, false)	5m 22s
build_windows (3.11, false)	11m 4s
build_linux (3.12, false)	5m 36s
build_windows (3.10, false)	11m 31s
build_windows (3.14, true)	11m 34s
build_windows (3.14, false)	10m 52s
test_examples_linux (3.11, false, ubuntu-22.04)	8m 27s
test_linux (3.10, false, false, ubuntu-22.04)	1m 5s
test_linux (3.14, false, false, ubuntu-22.04)	1m 4s
test_linux (3.14, true, false, ubuntu-22.04)	1m 9s
test_linux (3.13, false, false, ubuntu-22.04)	1m 6s
test_linux (3.11, false, false, ubuntu-22.04)	1m 7s
test_linux (3.12, false, false, ubuntu-22.04)	1m 7s
upload_linux	0s
test_windows (3.14, true, false, windows-latest)	4m 2s
test_windows (3.13, false, false, windows-latest)	4m 6s
test_windows (3.10, false, false, windows-latest)	4m 53s
test_windows (3.14, false, false, windows-latest)	4m 29s
test_windows (3.12, false, false, windows-latest)	4m 29s
test_windows (3.11, false, false, windows-latest)	4m 51s
upload_windows	0s
Clean up anaconda packages	0s
	2h 22m 31s

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