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/releases.go

@@ -7,7 +7,7 @@ import (
 	"code.gitea.io/tea/cmd/flags"
 	"code.gitea.io/tea/cmd/releases"
 
-	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v3"
 )
 
 // CmdReleases represents to login a gitea server.
@@ -20,7 +20,7 @@ var CmdReleases = cli.Command{
 	Description: "Manage releases",
 	ArgsUsage:   " ", // command does not accept arguments
 	Action:      releases.RunReleasesList,
-	Subcommands: []*cli.Command{
+	Commands: []*cli.Command{
 		&releases.CmdReleaseList,
 		&releases.CmdReleaseCreate,
 		&releases.CmdReleaseDelete,