Update jQuery to latest version

test-charts.php

@@ -14,7 +14,7 @@ include 'include/php/functions.php';
     <div id="piechart_div"></div>
     <div id="barchart_div"></div>
 
-    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.3/jquery.min.js"></script>
     <script src="https://www.gstatic.com/charts/loader.js"></script>
     <script>
         $(document).ready(function() {