ci: do not install Python in jobs where we are using cibuildwheel #1767

Job	Run time
Build wheels on Linux (aarch64/manylinux)	15m 54s
Build wheels on Linux (i686)	18m 49s
Build wheels on Linux (x86_64)	24m 0s
Build wheels on Linux (aarch64/musllinux)	6m 24s
Build wheels on macOS (arm64)	8m 20s
Build wheels on Windows (x64)	8m 33s
Build wheels for WebAssembly	6m 25s
Build wheels on macOS (x86_64)	16m 13s
Build with sanitizers for debugging purposes	2m 3s
Build sdist and test extra dependencies	3m 6s
Build wheels on Windows (ARM64)	8m 30s
Build wheels on Windows (Win32)	8m 26s
	2h 6m 43s

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