Deprecation: #81951 - Install Tool entry point moved

See forge#81951

Description

The canonical entry point for accessing the install tool now is:

typo3/install.php

Impact

Accessing typo3/install/ will still work and redirect to the new location, but has been deprecated.

Affected Installations

Every TYPO3 installation is affected.

Migration

Change bookmarks or scripts from the old entry point to the new one.