fix(deps): update rust crate crop to 0.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
crop	dependencies	minor	0.3.0 -> 0.4.0

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Release Notes

nomad/crop (crop)

v0.4.0

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Additions

• added a few new methods to Rope and RopeSlice that allow converting
  between UTF-16 and byte offsets by tracking the number of UTF-16 code units
  stored in those objects. It is important to note that these APIs come with a
  performance cost. As a result, these methods are only accessible by enabling
  a new feature flag called utf16-metric, which is disabled by default;

Performance

• the performance of Rope::replace was improved by another 10-15%;

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Configuration

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