select2 not focusing the input field on click

• Upstream issue: https://github.com/select2/select2/issues/5993
• Upstream fix: https://github.com/select2/select2/pull/6044

Example: https://mw-frontend-dev.tugraz.at/apps/demo/de/person-select

• click on empty select field
• it doesn't get focus so you need to click again before you can start typing