go.mod: github.com/spf13/cobra v1.6.1

We were using v1.0.0 of Cobra as newer versions added spf13/viper as dependency,
which came with many indirect dependencies. Cobra v1.6.0 and up no longer depend
on viper, so we can now safely upgrade to the latest version.

full diff: https://github.com/spf13/cobra/compare/v1.0.0...v1.6.1

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/spf13/pflag/string_array.go

@@ -23,6 +23,32 @@ func (s *stringArrayValue) Set(val string) error {
 	return nil
 }
 
+func (s *stringArrayValue) Append(val string) error {
+	*s.value = append(*s.value, val)
+	return nil
+}
+
+func (s *stringArrayValue) Replace(val []string) error {
+	out := make([]string, len(val))
+	for i, d := range val {
+		var err error
+		out[i] = d
+		if err != nil {
+			return err
+		}
+	}
+	*s.value = out
+	return nil
+}
+
+func (s *stringArrayValue) GetSlice() []string {
+	out := make([]string, len(*s.value))
+	for i, d := range *s.value {
+		out[i] = d
+	}
+	return out
+}
+
 func (s *stringArrayValue) Type() string {
 	return "stringArray"
 }