Bump indoc from 2.0.3 to 2.0.4 (#657)

Bumps [indoc](https://github.com/dtolnay/indoc) from 2.0.3 to 2.0.4.
- [Release notes](https://github.com/dtolnay/indoc/releases)
- [Commits](dtolnay/indoc@2.0.3...2.0.4)

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

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