Bump typetag from 0.2.7 to 0.2.8 (#1028)

Bumps [typetag](https://github.com/dtolnay/typetag) from 0.2.7 to 0.2.8.
- [Release notes](https://github.com/dtolnay/typetag/releases)
- [Commits](dtolnay/typetag@0.2.7...0.2.8)

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

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