build: Disable build cache for Python tests #1093

Job	Run time
Generic pre-commit checks	22s
Build on wasm32-unknown-unknown	25s
Verify commit messages	46s
Test draft201909 (stable) on ubuntu-22.04	55s
Test draft202012 (stable) on ubuntu-22.04	56s
Rustfmt	12s
Test draft201909 (stable) on macos-12	2m 19s
Run test coverage	1m 6s
Test draft202012 (stable) on macos-12	1m 30s
Python 3.7 on ubuntu-22.04	2m 13s
Test draft201909 (stable) on windows-2022	2m 48s
Python 3.8 on ubuntu-22.04	1m 52s
Test draft202012 (stable) on windows-2022	2m 26s
Python 3.9 on ubuntu-22.04	1m 59s
Clippy	1m 2s
Check features	1m 0s
Python 3.10 on ubuntu-22.04	2m 18s
Python 3.11 on ubuntu-22.04	1m 47s
Python 3.12 on ubuntu-22.04	1m 52s
Python 3.7 on macos-12	6m 45s
Python 3.8 on macos-12	5m 13s
Python 3.9 on macos-12	4m 22s
Python 3.10 on macos-12	4m 52s
Python 3.11 on macos-12	6m 34s
Python 3.12 on macos-12	4m 29s
Python 3.7 on windows-2022	5m 7s
Python 3.8 on windows-2022	5m 48s
Python 3.9 on windows-2022	4m 34s
Python 3.10 on windows-2022	3m 55s
Python 3.11 on windows-2022	4m 8s
Python 3.12 on windows-2022	4m 39s
	1h 28m 14s

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