feat: use `fs-err` in more places #69

Job	Run time
pre-commit	50s
Cargo Machete	1m 1s
determine changes	11s
cargo test \| ubuntu	4m 5s
cargo rustdoc \| ubuntu	57s
cargo test \| macos aarch64	4m 7s
cargo fmt \| ubuntu	14s
cargo clippy \| ubuntu	27s
build binary \| linux x86_64	1m 48s
build binary \| macos aarch64	3m 13s
build binary \| windows x86_64	4m 29s
cargo test \| windows	3m 57s
cargo test \| macos x86_64	0s
build binary \| macos x86_64	0s
build binary \| windows aarch64	4m 12s
pytest integration \| linux x86_64	8m 6s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 54s
pytest integration \| macos aarch64	4m 57s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	2m 2s
pytest integration \| windows x86_64	2m 47s
test wheel installation \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	2m 55s
	52m 12s

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