Bump cfg-if from 1.0.3 to 1.0.4 (#237)

Bumps [cfg-if](https://github.com/rust-lang/cfg-if) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/rust-lang/cfg-if/releases)
- [Changelog](https://github.com/rust-lang/cfg-if/blob/main/CHANGELOG.md)
- [Commits](rust-lang/cfg-if@v1.0.3...v1.0.4)

---
updated-dependencies:
- dependency-name: cfg-if
  dependency-version: 1.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]