Bump setup-python to v6; improve python detection #31

Job	Run time
Build Python 3.13.12 / Build Python for iOS and macOS	15m 29s
Build Python 3.14.3 / Build Python for iOS and macOS	10m 32s
Build Python 3.13.12 / Build Python for Android	7m 3s
Build Python 3.14.3 / Build Python for Windows	5m 6s
Build Python 3.14.3 / Build Python for Linux	34s
Build Python 3.12.12 / Build Python for iOS and macOS	19m 2s
Build Python 3.12.12 / Build Python for Linux	16s
Build Python 3.14.3 / Build Python for Android	7m 22s
Build Python 3.13.12 / Build Python for Windows	4m 29s
Build Python 3.13.12 / Build Python for Linux	26s
Build Python 3.12.12 / Build Python for Android	6m 15s
Build Python 3.12.12 / Build Python for Windows	4m 5s
Build Python 3.14.3 / Publish Release Assets	20s
Build Python 3.13.12 / Publish Release Assets	17s
Build Python 3.12.12 / Publish Release Assets	24s
	1h 21m 40s

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