build(deps): bump openssl from 0.10.66 to 0.10.68

Bumps [openssl](https://github.com/sfackler/rust-openssl) from 0.10.66 to 0.10.68.
- [Release notes](https://github.com/sfackler/rust-openssl/releases)
- [Commits](sfackler/rust-openssl@openssl-v0.10.66...openssl-v0.10.68)

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

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