This update removes an obsolete piece of code in the Time Off attendance integration that was left behind after earlier refactoring. It has no expected impact on day-to-day use, but helps keep the system cleaner and easier to maintain.

during refactoring of `hr_holidays` for 17.0 (commit https://github.com/odoo/odoo/commit/8f87e102a95412aa7dd1b0ce07365d9d3bbdba6a), the `_get_days_request` function has been removed in the `hr_holidays` module, but it is still overridden in `hr_holidays_attendance`

This update enhances the Odoo Enterprise softphone functionality by introducing 'infinite scrolling' within the contacts and recent calls tabs. This allows users to seamlessly browse through their call history without page refreshes, improving efficiency and usability. It's a minor enhancement to the user interface.

Backport of a00faee178b94e455a670fb59a3c77c3827b3b49