refactor(deps): migrate from nektos/act fork to gitea/runner (#37557)

Migrate to https://gitea.com/gitea/runner/releases/tag/v1.0.0 which
includes the `act` package directory previously referenced by
`nektos/act`.

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

routers/api/v1/repo/action.go

@@ -35,7 +35,7 @@ import (
 	"code.gitea.io/gitea/services/convert"
 	secret_service "code.gitea.io/gitea/services/secrets"
 
-	"github.com/nektos/act/pkg/model"
+	"gitea.com/gitea/runner/act/model"
 )
 
 // ListActionsSecrets list an repo's actions secrets