Bump schannel from 0.1.17 to 0.1.18 (#490)
Bump schannel from 0.1.17 to 0.1.18 (#490)

Bumps [schannel](https://github.com/steffengy/schannel-rs) from 0.1.17 to 0.1.18.
- [Release notes](https://github.com/steffengy/schannel-rs/releases)
- [Commits](https://github.com/steffengy/schannel-rs/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
alex/otp-cop