[BUGFIX] Flow\Utility\Exception missing

This exception is required by PackageManager

Resolves: #55132
Releases: 6.2
Change-Id: I80d966d581da78802dffd15c6bf27f50633a2f35
Reviewed-on: https://review.typo3.org/26925
Reviewed-by: Oliver Klee
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe