Bump openssl-sys from 0.9.80 to 0.9.81

Bumps [openssl-sys](https://github.com/sfackler/rust-openssl) from 0.9.80 to 0.9.81.
- [Release notes](https://github.com/sfackler/rust-openssl/releases)
- [Commits](sfackler/rust-openssl@openssl-sys-v0.9.80...openssl-sys-v0.9.81)

---
updated-dependencies:
- dependency-name: openssl-sys
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]