Fix package webhook (#27839) (#27855)

Backport #27839 by @lunny

Fix #23742

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

modules/structs/package.go

@@ -16,6 +16,7 @@ type Package struct {
 	Type       string      `json:"type"`
 	Name       string      `json:"name"`
 	Version    string      `json:"version"`
+	HTMLURL    string      `json:"html_url"`
 	// swagger:strfmt date-time
 	CreatedAt time.Time `json:"created_at"`
 }