Bump libssh2-sys from 0.2.21 to 0.2.23
Bump libssh2-sys from 0.2.21 to 0.2.23

Bumps [libssh2-sys](https://github.com/alexcrichton/ssh2-rs) from 0.2.21 to 0.2.23.
- [Release notes](https://github.com/alexcrichton/ssh2-rs/releases)
- [Commits](https://github.com/alexcrichton/ssh2-rs/compare/libssh2-sys-0.2.21...libssh2-sys-0.2.23)

---
updated-dependencies:
- dependency-name: libssh2-sys
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
saschagrunert/git-journal,saschagrunert/git-journal