Bump ssh2

Bumps [ssh2](https://github.com/mscdex/ssh2) from 0.5.5 to 1.4.0.
- [Release notes](https://github.com/mscdex/ssh2/releases)
- [Commits](mscdex/ssh2@v0.5.5...v1.4.0)

---
updated-dependencies:
- dependency-name: ssh2
  dependency-type: direct:production
...

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Author: dependabot[bot]