[TASK] Switch to new REST API end point

The core version service now uses the new entry point of the REST API
available via https://get.typo3.org/api.

The old entry point is still available but should not be longer used.

For more information see `https://get.typo3.org/api/doc <https://get.typo3.org/api/doc>`_
and `https://github.com/TYPO3/get.typo3.org/pull/272 <https://github.com/TYPO3/get.typo3.org/pull/272>`_.

Resolves: #92020
Releases: main, 11.5, 10.4
Change-Id: I2c92554e9ba212827b6412d4a88ac5c92e26aa17
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65342


Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>