[BUGFIX] sys_collection_entries column too small

Set sys_collection_entries to varchar(64). This is the max
table name length on MySQL.

Resolves: #60180
Releases: 6.3,6.2
Change-Id: I253e6eb6cb35db9e6d13a716bfc5c8d89db4ca7e
Reviewed-on: https://review.typo3.org/31698
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>