Implement update branch API (#32433)

Resolves #22526.

Builds upon #23061.

---------

Co-authored-by: sillyguodong <33891828+sillyguodong@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/api/v1/swagger/options.go

@@ -90,6 +90,8 @@ type swaggerParameterBodies struct {
 	// in:body
 	EditRepoOption api.EditRepoOption
 	// in:body
+	UpdateBranchRepoOption api.UpdateBranchRepoOption
+	// in:body
 	TransferRepoOption api.TransferRepoOption
 	// in:body
 	CreateForkOption api.CreateForkOption