fix: update navbar toggle button to use Bootstrap 5 data attributes

Author: ChaosEngine

src/IdentityManager2/Assets/Templates/navbar.html

@@ -4,7 +4,7 @@
             <img ng-src="{{PathBase}}/assets/Content.logo.png" class="logo-banner">
             IdentityManager 2
         </a>
-        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#nav" aria-expanded="false">
+        <button type="button" class="navbar-toggle collapsed" data-bs-toggle="collapse" data-bs-target="#nav" aria-expanded="false">
             <span class="sr-only">Toggle navigation</span>
             <span class="icon-bar"></span>
             <span class="icon-bar"></span>