Bump zerovec from 0.10.2 to 0.10.4 in /compiler-rs (#2689)

Bumps [zerovec](https://github.com/unicode-org/icu4x) from 0.10.2 to 0.10.4.
- [Release notes](https://github.com/unicode-org/icu4x/releases)
- [Changelog](https://github.com/unicode-org/icu4x/blob/main/CHANGELOG.md)
- [Commits](https://github.com/unicode-org/icu4x/commits/ind/[email protected])

---
updated-dependencies:
- dependency-name: zerovec
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]