Broken highlights in go files when using raw string literal in some cases

[alexr00]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.62.0 + https://vscode.dev as well

• OS Version: Arch Linux

Steps to Reproduce:

1. Open an empty Go file
2. Paste this code:

package main

import (
	"fmt"
)

func main() {
	var a interface{} = []byte(`{"a": "When only 1 line it's ok."}`)
	fmt.Println(a)
	var b interface{} = []byte(`{
		"b": "But when multiple lines highlighting is broken."
	}`)
	fmt.Println(b)
	// And only one more ` will stop it...
}

Github highlights it correctly but here's how VS Code does it:

Originally from @DimaGashko in microsoft/vscode#141360