"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js" wordpress functions.php code example
Example: jquery cdn cloudflare
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>