chore(deps): bump arrayvec from 0.7.7 to 0.7.8

Bumps [arrayvec](https://github.com/bluss/arrayvec) from 0.7.7 to 0.7.8.
- [Release notes](https://github.com/bluss/arrayvec/releases)
- [Changelog](https://github.com/bluss/arrayvec/blob/master/CHANGELOG.md)
- [Commits](bluss/arrayvec@0.7.7...0.7.8)

---
updated-dependencies:
- dependency-name: arrayvec
  dependency-version: 0.7.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]