Bump lru from 0.18.3 to 0.18.4

Bumps [lru](https://github.com/jeromefroe/lru-rs) from 0.18.3 to 0.18.4.
- [Changelog](https://github.com/jeromefroe/lru-rs/blob/master/CHANGELOG.md)
- [Commits](jeromefroe/lru-rs@0.18.3...0.18.4)

---
updated-dependencies:
- dependency-name: lru
  dependency-version: 0.18.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]