Update to bootstrap 3.4.1

Author: ryanbrandenburg

src/Identity/UI/src/Areas/Identity/Pages/_Layout.cshtml

@@ -14,7 +14,7 @@
         <link rel="stylesheet" href="~/Identity/css/site.css" />
     </environment>
     <environment exclude="Development">
-        <link rel="stylesheet" href="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.7/css/bootstrap.min.css"
+        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
               asp-fallback-href="~/Identity/lib/bootstrap/dist/css/bootstrap.min.css"
               asp-fallback-test-class="sr-only" asp-fallback-test-property="position" asp-fallback-test-value="absolute" />
         <link rel="stylesheet" href="~/Identity/css/site.min.css" asp-append-version="true" />
@@ -69,11 +69,11 @@
                 crossorigin="anonymous"
                 integrity="sha384-tsQFqpEReu7ZLhBV2VZlAu7zcOV+rXbYlF2cqB8txI/8aZajjp4Bqd+V6D5IgvKT">
         </script>
-        <script src="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.7/bootstrap.min.js"
+        <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"
                 asp-fallback-src="~/Identity/lib/bootstrap/dist/js/bootstrap.min.js"
                 asp-fallback-test="window.jQuery && window.jQuery.fn && window.jQuery.fn.modal"
                 crossorigin="anonymous"
-                integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa">
+                integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd">
         </script>
         <script src="~/Identity/js/site.min.js" asp-append-version="true"></script>
     </environment>