Bump urfave/cli version

urfave/cli added functionality for generating Fish shell tab-completions
a few releases ago. We bump the dependency version to get access to
this functionality.

go.mod

@@ -57,7 +57,7 @@ require (
 	github.com/stephens2424/writerset v1.0.2 // indirect
 	github.com/stretchr/testify v1.7.0
 	github.com/tv42/zbase32 v0.0.0-20160707012821-501572607d02
-	github.com/urfave/cli v1.20.0
+	github.com/urfave/cli v1.22.4
 	go.etcd.io/etcd/client/pkg/v3 v3.5.0
 	go.etcd.io/etcd/client/v3 v3.5.0
 	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519