volume/update: require 1 argument/fix panic

This command was declaring that it requires at least 1 argument, when it
needs exactly 1 argument. This was causing the CLI to panic when the
command was invoked with no argument:

`docker volume update`

Signed-off-by: Laura Brehm <laurabrehm@hey.com>

cli/command/volume/update.go

@@ -18,7 +18,7 @@ func newUpdateCommand(dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "update [OPTIONS] [VOLUME]",
 		Short: "Update a volume (cluster volumes only)",
-		Args:  cli.RequiresMaxArgs(1),
+		Args:  cli.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runUpdate(cmd.Context(), dockerCli, args[0], availability, cmd.Flags())
 		},

cli/command/volume/update_test.go

@@ -0,0 +1,22 @@
+package volume
+
+import (
+	"io"
+	"testing"
+
+	"github.com/docker/cli/internal/test"
+	"gotest.tools/v3/assert"
+)
+
+func TestUpdateCmd(t *testing.T) {
+	cmd := newUpdateCommand(
+		test.NewFakeCli(&fakeClient{}),
+	)
+	cmd.SetArgs([]string{})
+	cmd.SetOut(io.Discard)
+	cmd.SetErr(io.Discard)
+
+	err := cmd.Execute()
+
+	assert.ErrorContains(t, err, "requires 1 argument")
+}