build(deps): bump libflate from 2.0.0 to 2.2.1

Bumps [libflate](https://github.com/sile/libflate) from 2.0.0 to 2.2.1.
- [Release notes](https://github.com/sile/libflate/releases)
- [Commits](sile/libflate@2.0.0...v2.2.1)

---
updated-dependencies:
- dependency-name: libflate
  dependency-version: 2.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]