Downgrade jQuery to 3.5.1

Revert when select2/select2#5993 is fixed

Author: tagliala

docs/index.html

@@ -221,7 +221,7 @@ <h3>Example of <a href="https://github.com/ttskch/select2-bootstrap4-theme" targ
 </div>
 
 <!-- bootstrap -->
-<script src="https://cdn.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.slim.min.js" integrity="sha256-u7e5khyithlIdTpu22PHhENmPcRdFiHRjhAuHcs05RI=" crossorigin="anonymous"></script>
+<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha256-4+XzXVhsDmqanXGHaHvgh1gMQKX40OUvDEBTu8JcmNs=" crossorigin="anonymous"></script>
 <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
 <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.min.js" integrity="sha256-7dA7lq5P94hkBsWdff7qobYkp9ope/L5LQy2t/ljPLo=" crossorigin="anonymous"></script>
 <!-- select2 -->