Upgrade JS Libraries

Upgrade Fullcalendar to v6 (implements #186)
Upgrade jQuery to v3.6 (implements #185)
Upgrade Select2 to v4.0.13
Remove tag information leftover in track manager

templates/admin/base_site.html

@@ -15,7 +15,7 @@
 {% block extrahead %}
     <!-- Load bootstrap, jquery and fontawesome-->
     {% bootstrap_javascript %}
-    <script src="{% static 'common/vendor/jquery/jquery-3.3.1.min.js' %}"></script>
+    <script src="{% static 'common/vendor/jquery/jquery-3.6.3.min.js' %}"></script>
     {% fontawesome_6_static %}
 
     <style>

templates/base.html

@@ -15,7 +15,7 @@
     <!-- Load bootstrap, jquery and fontawesome-->
     {% bootstrap_css %}
     {% bootstrap_javascript %}
-    <script src="{% static 'common/vendor/jquery/jquery-3.3.1.min.js' %}"></script>
+    <script src="{% static 'common/vendor/jquery/jquery-3.6.3.min.js' %}"></script>
     {% fontawesome_6_static %}
 
     <link rel="stylesheet" href="{% static 'common/css/custom.css' %}">