Better error message when normalize path failed

[messense]

Before

$ maturin sdist -m ~/Desktop/ruff/ruff_cli/Cargo.toml -o dist
💥 maturin failed
  Caused by: No such file or directory (os error 2)

After

$ maturin sdist -m ~/Desktop/ruff/ruff_cli/Cargo.toml -o dist
💥 maturin failed
  Caused by: failed to normalize path `/Users/messense/Desktop/ruff/ruff_cli/Cargo.toml`
  Caused by: No such file or directory (os error 2)

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[messense]

bors r+

[bors]

Build succeeded:

• conclusion
• Test (arm64 Linux)
• Test (arm64 macOS)
• Test (x86_64 FreeBSD)