Bump hermit-abi from 0.1.19 to 0.1.20

Bumps [hermit-abi](https://github.com/hermitcore/rusty-hermit) from 0.1.19 to 0.1.20.
- [Release notes](https://github.com/hermitcore/rusty-hermit/releases)
- [Commits](hermit-os/hermit-rs@hermit-abi-0.1.19...hermit-abi-0.1.20)

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

Signed-off-by: dependabot[bot] <support@github.com>