Tidy Go submodules

Their transient dependencies must be updated following the update to the root module's github.com/spf13/cobra dependency

Author: per1234

docsgen/go.mod

@@ -11,5 +11,5 @@ 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 v1.2.1
+	github.com/spf13/cobra v1.3.0
 )