Bump typetag from 0.2.14 to 0.2.15

Bumps [typetag](https://github.com/dtolnay/typetag) from 0.2.14 to 0.2.15.
- [Release notes](https://github.com/dtolnay/typetag/releases)
- [Commits](dtolnay/typetag@0.2.14...0.2.15)

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

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

Author: dependabot[bot]