Updated deps and misc fixes and updates

- Updated some Rust dependencies
- Fixed an issue with CSP header, this was not configured correctly
- Prevent sending CSP and Frame headers for the MFA connector.html files.
  Else some clients will fail to handle these protocols.
- Add `unsafe-inline` for `script-src` only to the CSP for the Admin Interface
- Updated JavaScript and CSS files for the Admin interface
- Changed the layout for showing overridden settings, better visible now.
- Made the version check cachable to prevent hitting the Github API rate limits
- Hide the `database_url` as if it is a password in the Admin Interface
  Else for MariaDB/MySQL or PostgreSQL this was plain text.
- Fixed an issue that pressing enter on the SMTP Test would save the config.
  resolves #2542
- Prevent user names larger then 50 characters
  resolves #2419

src/static/templates/admin/base.hbs

@@ -20,8 +20,15 @@
             width: auto;
             margin: -5px 0 0 0;
         }
+        /* Special alert-row class to use Bootstrap v5.2+ variable colors */
+        .alert-row {
+            --bs-alert-border: 1px solid var(--bs-alert-border-color);
+            color: var(--bs-alert-color);
+            background-color: var(--bs-alert-bg);
+            border: var(--bs-alert-border);
+        }
     </style>
-    <script src="{{urlpath}}/vw_static/identicon.js"></script>
+    <script defer="defer" src="{{urlpath}}/vw_static/identicon.js"></script>
     <script>
         'use strict';
 
@@ -135,6 +142,6 @@
             }
         })();
     </script>
-    <script src="{{urlpath}}/vw_static/bootstrap-native.js"></script>
+    <script defer="defer" src="{{urlpath}}/vw_static/bootstrap-native.js"></script>
 </body>
 </html>