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>

templates/swagger/v1_json.tmpl

@@ -21039,6 +21039,10 @@
         "creator": {
           "$ref": "#/definitions/User"
         },
+        "html_url": {
+          "type": "string",
+          "x-go-name": "HTMLURL"
+        },
         "id": {
           "type": "integer",
           "format": "int64",