Bugfix and maintenance release with support for TYPO3 12.4 LTS

In addition to version 7.0.0 of the extension, this version only supports TYPO3 12.4 and does most likely not use deprecated code any more. When updating a website to TYPO3 12.4, make sure to also read the release notes for version 7.0.0 of the extension carefully.

Release notes: https://github.com/derhansen/sf_event_mgt/releases/tag/7.1.0