Bump libflate from 2.0.0 to 2.1.0 in /lang/rust (#2884)

Bumps [libflate](https://github.com/sile/libflate) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/sile/libflate/releases)
- [Commits](https://github.com/sile/libflate/compare/2.0.0...2.1.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
(cherry picked from commit bda4ec87a7916c45595b4e7d41b405e8f4002d0f)
2 files changed