Bump anyhow from 1.0.79 to 1.0.80 in /packer

Bumps [anyhow](https://github.com/dtolnay/anyhow) from 1.0.79 to 1.0.80.
- [Release notes](https://github.com/dtolnay/anyhow/releases)
- [Commits](dtolnay/anyhow@1.0.79...1.0.80)

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

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