refactor(core): drop the bootstrap-select javascript library

Its not being used anywhere, we use the `bootstrap-multiselect` library
instead.

apis_core/core/templates/base.html

@@ -45,8 +45,6 @@
     {% endblock favicons %}
 
     {% block styles %}
-      <link rel="stylesheet"
-            href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.1/css/bootstrap-select.min.css" />
       <link rel="stylesheet"
             href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.15/css/bootstrap-multiselect.css" />
       <link rel="stylesheet"
@@ -243,8 +241,6 @@
 
     {% block scripts %}
       {% include "partials/bootstrap4_js.html" %}
-      <script type="text/javascript"
-              src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.1/js/bootstrap-select.min.js"></script>
       <script src="https://unpkg.com/[email protected]"></script>
       <script>
         document.body.addEventListener('htmx:beforeSwap', function(event) {