Preserve file permission when copying #3939

Job	Run time
Generate Matrix	3s
Test Emscripten	0s
Test Alpine Linux	0s
Test Auditwheel	0s
Test Cross Compile	0s
Test Bootstrap (ubuntu-latest)	8s
Test Bootstrap (macos-14)	11s
Test Bootstrap (windows-latest)	15s
Test Docker	0s
Test MSRV	1m 57s
Test Pyston	0s
Test downstream - ${{ matrix.downstream.repository }}	0s
Check ${{ matrix.platform.target }}	0s
Test (ubuntu-latest, 3.12)	26m 30s
Test (ubuntu-latest, pypy3.10)	11m 41s
Test (macos-14, 3.12)	8m 9s
Test (windows-latest, 3.12)	23m 23s
Test (windows-latest, pypy3.10)	23m 13s
conclusion	1s
	1h 35m 31s

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