chore(dep): Use tag version for cobra (#1458)

This commit is to use tag version for cobra (e.g. 1.1.1). The main
benefit is that this can be managed and upgraded by dependabot later.

This is follow-up item from PR #1201.

Signed-off-by: Tam Mach <[email protected]>

Author: sayboras

go.mod

@@ -49,7 +49,7 @@ require (
 	github.com/sirupsen/logrus v1.7.0
 	github.com/sonatard/noctx v0.0.1
 	github.com/sourcegraph/go-diff v0.6.1
-	github.com/spf13/cobra v1.0.1-0.20200916152758-7f8e83d9366a
+	github.com/spf13/cobra v1.1.1
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.7.1
 	github.com/ssgreg/nlreturn/v2 v2.1.0