Bumps [github.com/pkg/sftp](https://github.com/pkg/sftp) from 1.13.3 to 1.13.4.
- [Release notes](https://github.com/pkg/sftp/releases)
- [Commits](pkg/sftp@v1.13.3...v1.13.4)

---
updated-dependencies:
- dependency-name: github.com/pkg/sftp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

…pkg/sftp-1.13.4

Bump github.com/pkg/sftp from 1.13.3 to 1.13.4

In case the Port is given in the ssh config already...

The ssh command will know the default port, otherwise.

Signed-off-by: Anders F Björklund <anders.f.bjorklund@gmail.com>

Stop hardcoding the default port for ssh

Bumps [github.com/urfave/cli/v2](https://github.com/urfave/cli) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/urfave/cli/releases)
- [Changelog](https://github.com/urfave/cli/blob/master/docs/CHANGELOG.md)
- [Commits](urfave/cli@v2.3.0...v2.4.0)

---
updated-dependencies:
- dependency-name: github.com/urfave/cli/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

…urfave/cli/v2-2.4.0

Bump github.com/urfave/cli/v2 from 2.3.0 to 2.4.0

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Remove github.com/pkg/errors, Go 1.16 CI; bump up go.mod