Fix minor design issues and upgrade dependencies

• Remove pinning of MySQL version to ensure CI runs for newest django version
• Fix design issues (button heights) in admin interface
• Upgrade several dependencies (django, django plugins, fontawesome, tzdata)

templates/admin/base_site.html

@@ -32,6 +32,11 @@
             font-size: 5vw;
             text-align: center;
         }
+
+        /* Fix delete button height in admin interface */
+        .submit-row a.deletelink, .delete-confirmation form .cancel-link {
+            height: auto!important;
+        }
         </style>
     {% endcompress %}
 {% endblock %}