Update module github.com/urfave/cli to v2

[plural-bot]

This PR contains the following updates:

Package	Type	Update	Change
github.com/urfave/cli	require	major	v1.22.10 -> v2.23.4

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[plural-bot]

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[davidspek]

@zreigz we should probably rebase this and try and get it merged.

[zreigz]

Yes I will add this to the linear

[zreigz]

@davidspek there is a problem with the cli.Context.

func requireArgs(fn func(*cli.Context) error, args []string) func(*cli.Context) error {
	return func(c *cli.Context) error {
		nargs := c.NArg()

The method c.NArg() returns the number of arguments and flags.
The method c.FlagNames() always returns a nil object so we can't distinguish between flags and arguments.
It causes problems with command:
plural vpn create-client test-client --server wireguard2

In v1 nargs = 1 but in v2 nargs = 3 so requireArgs will fail with error Too many args passed ...