upgrade django-select2 to latest version 7.2.2

requirements.txt

@@ -25,7 +25,7 @@ django-tables2==1.21.2
 django-tinymce4-lite==1.7.5
 django-two-factor-auth==1.9.1
 django-webpack-loader==0.6.0
-django_select2==7.2.0
+django_select2==7.2.2
 djangorestframework==3.9.2
 djangorestframework-api-key==1.4.1
 django==2.2.11