Function `update_one` cannot accept `CanonicalPathBuf` for deleted files

[kirillt]

This is an oversight of implementation in #42

See #38 for more context. TL;DR: We use update_one for cases when a resource by some path changed or was deleted at all. We can't canonicalize a non-existent path, so we fail to call update_one in this case. This API should receive plain Path-like type: Path, PathBuf or be generic with AsRef<Path>.

[kirillt]

This is necessary for this PR:

• Index update one arklib-android#91