Bump github.com/spf13/cobra from 1.3.0 to 1.4.0

Bumps [github.com/spf13/cobra](https://github.com/spf13/cobra) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/spf13/cobra/releases)
- [Changelog](https://github.com/spf13/cobra/blob/master/CHANGELOG.md)
- [Commits](spf13/cobra@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: github.com/spf13/cobra
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/sanathkr/go-yaml v0.0.0-20170819195128-ed9d249f429b
 	github.com/sirupsen/logrus v1.8.1
-	github.com/spf13/cobra v1.3.0
+	github.com/spf13/cobra v1.4.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.7.0
 	github.com/theupdateframework/notary v0.6.1