vendor: update all dependencies to latest versions

vendor/github.com/spf13/cobra/zsh_completions.go

@@ -4,17 +4,29 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"os"
 	"strings"
 )
 
+// GenZshCompletionFile generates zsh completion file.
+func (c *Command) GenZshCompletionFile(filename string) error {
+	outFile, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer outFile.Close()
+
+	return c.GenZshCompletion(outFile)
+}
+
 // GenZshCompletion generates a zsh completion file and writes to the passed writer.
-func (cmd *Command) GenZshCompletion(w io.Writer) error {
+func (c *Command) GenZshCompletion(w io.Writer) error {
 	buf := new(bytes.Buffer)
 
-	writeHeader(buf, cmd)
-	maxDepth := maxDepth(cmd)
+	writeHeader(buf, c)
+	maxDepth := maxDepth(c)
 	writeLevelMapping(buf, maxDepth)
-	writeLevelCases(buf, maxDepth, cmd)
+	writeLevelCases(buf, maxDepth, c)
 
 	_, err := buf.WriteTo(w)
 	return err