feat: gitea: vendor + fix heatmap

package/gitea/source/modules/util/runtime.go

@@ -0,0 +1,13 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package util
+
+import "runtime"
+
+func CallerFuncName(skip int) string {
+	pc := make([]uintptr, 1)
+	runtime.Callers(skip+1, pc)
+	funcName := runtime.FuncForPC(pc[0]).Name()
+	return funcName
+}