Fix PushEvent NullPointerException jenkinsci/github-plugin (#27203)

Fixes #27202

modules/structs/repo.go

@@ -63,6 +63,7 @@ type Repository struct {
 	Language      string      `json:"language"`
 	LanguagesURL  string      `json:"languages_url"`
 	HTMLURL       string      `json:"html_url"`
+	URL           string      `json:"url"`
 	Link          string      `json:"link"`
 	SSHURL        string      `json:"ssh_url"`
 	CloneURL      string      `json:"clone_url"`