Adjust path delimiters in GitHub Actions workflows for Windows. #174

Job	Run time
Python 3.7 with ABI cp37 for macOS 10.9	7m 53s
Python 3.8 with ABI cp38 for macOS 10.9	9m 25s
Python 3.9 with ABI cp39 for macOS 10.9	7m 38s
Python 3.9 with ABI cp39 for macOS 11 ARM	2m 58s
Python 3.10 with ABI cp310 for macOS 11 ARM	2m 51s
Python 3.11 with ABI cp311 for macOS 11 ARM	2m 49s
Python 3.7 with ABI cp37 for manylinux2014_x86_64	5m 51s
Python 3.8 with ABI cp38 for manylinux2014_x86_64	4m 50s
Python 3.9 with ABI cp39 for manylinux2014_x86_64	6m 13s
Python 3.10 with ABI cp310 for manylinux2014_x86_64	5m 27s
Python 3.11 with ABI cp311 for manylinux2014_x86_64	6m 32s
Python 3.7 with ABI cp37 for Windows x86	3m 59s
Python 3.8 with ABI cp38 for Windows x86	3m 1s
Python 3.9 with ABI cp39 for Windows x86	3m 42s
Python 3.10 with ABI cp310 for Windows x86	5m 28s
Python 3.11 with ABI cp311 for Windows x86	2m 58s
Python 3.7 with ABI cp37 for Windows x64	3m 15s
Python 3.8 with ABI cp38 for Windows x64	2m 44s
Python 3.9 with ABI cp39 for Windows x64	2m 44s
Python 3.10 with ABI cp310 for Windows x64	2m 32s
Python 3.11 with ABI cp311 for Windows x64	3m 29s
	1h 36m 19s

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