feat: gitea: vendor + fix heatmap

package/gitea/source/models/migrations/v1_21/v277.go

@@ -0,0 +1,16 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_21
+
+import (
+	"xorm.io/xorm"
+)
+
+func AddIndexToIssueUserIssueID(x *xorm.Engine) error {
+	type IssueUser struct {
+		IssueID int64 `xorm:"INDEX"`
+	}
+
+	return x.Sync(new(IssueUser))
+}