[TASK] Remove obsolete jQuery plugin 'matchHeight'

Since using flexbox for displaying boxes at the same height in module
'About' the jQuery plugin 'matchHeight' is not needed anymore.

Resolves: #81493
Releases: master
Change-Id: I1f593111804cd34f66beee472cbdd4ac258fc0ab
Reviewed-on: https://review.typo3.org/53149


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>