Bump aho-corasick from 0.7.18 to 0.7.20

Bumps [aho-corasick](https://github.com/BurntSushi/aho-corasick) from 0.7.18 to 0.7.20.
- [Release notes](https://github.com/BurntSushi/aho-corasick/releases)
- [Commits](BurntSushi/aho-corasick@0.7.18...0.7.20)

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

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

Author: dependabot[bot]