Bump libz-sys from 1.1.11 to 1.1.12 (#710)

Bumps [libz-sys](https://github.com/rust-lang/libz-sys) from 1.1.11 to 1.1.12.
- [Release notes](https://github.com/rust-lang/libz-sys/releases)
- [Commits](rust-lang/libz-sys@1.1.11...1.1.12)

---
updated-dependencies:
- dependency-name: libz-sys
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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