The channel field is more flexible than types, and will be populated
by PSR-3 loggers as well. Switch belog to use that instead of the old
type ints.

Resolves: #94439
Relates to: 94356
Releases: master
Change-Id: Ia834a63be88e17aaca62d806940d0404273050ae
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69663


Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>