Calendar (Accessibility issue): Calendar icon is not focused

[danalt06]

Describe the bug

The calendar icon is not focusable when showIcon is enabled and you navigate using Tab.

Reproducible on the primereact documentation page: https://v9.primereact.org/calendar/

Reproducer

https://stackblitz.com/run?file=src%2FApp.js

System Information

"primereact": "^10.9.7",
"react": "^18.2.0",

Steps to reproduce the behavior

1. Set showIcon on the Calendar component
2. Navigate via tab on the keyboard to the calendar
3. The calendar icon is not focused

Expected behavior

When navigating to the Calendar, the calendar icon is focused