Bump flat-cache from 3.0.4 to 3.1.0

Bumps [flat-cache](https://github.com/jaredwray/flat-cache) from 3.0.4 to 3.1.0.
- [Changelog](https://github.com/jaredwray/flat-cache/blob/master/changelog.md)
- [Commits](https://github.com/jaredwray/flat-cache/commits)

---
updated-dependencies:
- dependency-name: flat-cache
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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