Bump batr from 2.1.8 to 2.1.9

Bumps [batr](https://github.com/eklem/batr) from 2.1.8 to 2.1.9.
- [Release notes](https://github.com/eklem/batr/releases)
- [Commits](eklem/batr@V2.1.8...v2.1.9)

---
updated-dependencies:
- dependency-name: batr
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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