build(deps): bump flatbush from 4.2.0 to 4.4.0 (#199)

Bumps [flatbush](https://github.com/mourner/flatbush) from 4.2.0 to 4.4.0.
- [Release notes](https://github.com/mourner/flatbush/releases)
- [Commits](mourner/flatbush@v4.2.0...v4.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>