Add create_at and updated_at in PR json (#1616)

* Move new fields to object creation (use reference)
 * Vendor: Update SDK

vendor/code.gitea.io/sdk/gitea/pull.go

@@ -38,6 +38,9 @@ type PullRequest struct {
 	Base      *PRBranchInfo `json:"base"`
 	Head      *PRBranchInfo `json:"head"`
 	MergeBase string        `json:"merge_base"`
+
+	Created *time.Time `json:"created_at"`
+	Updated *time.Time `json:"updated_at"`
 }
 
 // PRBranchInfo base branch info when send a PR