Bump cfg-expr from 0.15.2 to 0.15.4 (#14808)

Bumps [cfg-expr](https://github.com/EmbarkStudios/cfg-expr) from 0.15.2 to 0.15.4.
- [Release notes](https://github.com/EmbarkStudios/cfg-expr/releases)
- [Changelog](https://github.com/EmbarkStudios/cfg-expr/blob/main/CHANGELOG.md)
- [Commits](https://github.com/EmbarkStudios/cfg-expr/compare/0.15.2...0.15.4)

---
updated-dependencies:
- dependency-name: cfg-expr
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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