Bump dtoa from 1.0.6 to 1.0.8

Bumps [dtoa](https://github.com/dtolnay/dtoa) from 1.0.6 to 1.0.8.
- [Release notes](https://github.com/dtolnay/dtoa/releases)
- [Commits](dtolnay/dtoa@1.0.6...1.0.8)

---
updated-dependencies:
- dependency-name: dtoa
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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