[TASK] Make pages.author VARCHAR(255)

This was a VARCHAR(255) before #104098, which considers
TCA 'max' property and thus reduced it to VARCHAR(80).
To avoid upgrade issues, 'max' is now increased to 255,
which makes it a VARCHAR(255) again.

Resolves: #104143
Related: #101553
Related: #104098
Releases: main
Change-Id: I96f36ed1259473550ae4bd29b646b1d23f74b706
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84772


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Wand <wand@itaw.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>