Bump github.com/spf13/cobra from 1.1.1 to 1.2.1 in /docsgen

Bumps [github.com/spf13/cobra](https://github.com/spf13/cobra) from 1.1.1 to 1.2.1.
- [Release notes](https://github.com/spf13/cobra/releases)
- [Changelog](https://github.com/spf13/cobra/blob/master/CHANGELOG.md)
- [Commits](spf13/cobra@v1.1.1...v1.2.1)

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

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

Author: dependabot[bot]

docsgen/go.mod

@@ -9,5 +9,5 @@ replace github.com/oleiade/reflections => github.com/oleiade/reflections v1.0.1
 
 require (
 	github.com/arduino/arduino-lint v0.0.0
-	github.com/spf13/cobra v1.1.1
+	github.com/spf13/cobra v1.2.1
 )