chore: use stdlib uuid package

Go 1.27 ships a uuid package with the same API, dropping the direct
dependency on github.com/google/uuid.

Assisted-by: Claude:Opus 5

routers/api/actions/runner/runner.go

@@ -20,10 +20,10 @@ import (
 	actions_service "gitea.dev/services/actions"
 
 	"connectrpc.com/connect"
-	gouuid "github.com/google/uuid"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/proto"
+	"uuid"
 )
 
 func NewRunnerServiceHandler() (string, http.Handler) {
@@ -74,7 +74,7 @@ func (s *Service) Register(
 	// create new runner
 	name := util.EllipsisDisplayString(req.Msg.Name, 255)
 	runner := &actions_model.ActionRunner{
-		UUID:                 gouuid.New().String(),
+		UUID:                 uuid.New().String(),
 		Name:                 name,
 		OwnerID:              runnerToken.OwnerID,
 		RepoID:               runnerToken.RepoID,