internal/task: work around no LUCI support for release-branch.go1.19

We've switched to using LUCI trybots that require release-branch.go1.20
or higher. Add a work around for one more Go 1.19 release that needs it.

For golang/go#62076.

Change-Id: I3c66f50392f4c249d2c063b8ff46423bd42a3dbe
Reviewed-on: https://go-review.googlesource.com/c/build/+/526215
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>

internal/task/version.go

@@ -184,6 +184,11 @@ func (t *VersionTasks) GenerateVersionFile(_ *workflow.TaskContext, distpack boo
 
 // CreateAutoSubmitVersionCL mails an auto-submit change to update VERSION file on branch.
 func (t *VersionTasks) CreateAutoSubmitVersionCL(ctx *workflow.TaskContext, branch, version string, reviewers []string, versionFile string) (string, error) {
+	// TODO(go.dev/issue/62076): Remove after Go 1.19.13 is out.
+	if branch == "release-branch.go1.19" && version == "go1.19.13" {
+		return "go~526138", nil // Use the CL it already created (but failed to add votes/reviewers to).
+	}
+
 	return t.Gerrit.CreateAutoSubmitChange(ctx, gerrit.ChangeInput{
 		Project: t.GoProject,
 		Branch:  branch,