fix: Add secret to all webhook's payload where it has been missing (#5208)

* Updated dependency manager via `dep ensure -update code.gitea.io/sdk`
* Gopkg.toml was not changed as sdk version is set to "master"
* affects webhooks for: Delete, Fork, IssueComment, Release
* also contains changes from go-gitea/go-sdk#125 and hence a swagger update

Signed-off-by: Berengar W. Lehr <Berengar.Lehr@kompetenztest.de>
Resolves: #4732, #5173

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

@@ -152,3 +152,9 @@ type IssueDeadline struct {
 	// swagger:strfmt date-time
 	Deadline *time.Time `json:"due_date"`
 }
+
+// EditPriorityOption options for updating priority
+type EditPriorityOption struct {
+	// required:true
+	Priority int `json:"priority"`
+}