Bump indoc from 2.0.5 to 2.0.6

Bumps [indoc](https://github.com/dtolnay/indoc) from 2.0.5 to 2.0.6.
- [Release notes](https://github.com/dtolnay/indoc/releases)
- [Commits](dtolnay/indoc@2.0.5...2.0.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]