fix Windows-specific path normalization using GetLongPathNameW #1176

Job	Run time
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 46s
Tests (macos-14, aarch64-apple-darwin, yes)	13m 54s
Builds (windows-latest, x86_64-pc-windows-msvc)	3m 47s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 31s
Tests (macos-latest, x86_64-apple-darwin, yes)	14m 35s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 37s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 34s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	10m 4s
Builds (macos-latest, x86_64-apple-darwin, yes)	1m 51s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 31s
Builds (windows-latest, aarch64-pc-windows-msvc)	4m 11s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 42s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	7m 36s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	3m 9s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 8s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	4m 39s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 45s
	1h 35m 20s

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