migrate tea to urfave v3 (#760)

I tested this somewhat, but I haven't been using the cli before so I'm not sure if there are changes - there shouldn't be though.

Reviewed-on: https://gitea.com/gitea/tea/pulls/760
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: TheFox0x7 <thefox0x7@gmail.com>
Co-committed-by: TheFox0x7 <thefox0x7@gmail.com>

cmd/whoami.go

@@ -4,10 +4,11 @@
 package cmd
 
 import (
+	stdctx "context"
+
 	"code.gitea.io/tea/modules/context"
 	"code.gitea.io/tea/modules/print"
-
-	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v3"
 )
 
 // CmdWhoami represents the command to show current logged in user
@@ -17,7 +18,7 @@ var CmdWhoami = cli.Command{
 	Description: `For debugging purposes, show the user that is currently logged in.`,
 	Usage:       "Show current logged in user",
 	ArgsUsage:   " ", // command does not accept arguments
-	Action: func(cmd *cli.Context) error {
+	Action: func(_ stdctx.Context, cmd *cli.Command) error {
 		ctx := context.InitCommand(cmd)
 		client := ctx.Login.Client()
 		user, _, _ := client.GetMyUserInfo()