#32206 - Adjustments for Shopware 5.6

Malte Petersrequested to merge
mpeters/NetiMultipleVouchers:32206 into 4.0

This MR contains adjustments for Shopware 5.6.

Please check if all HelperServices are replaced correctly. Besides the plugin should work correct continuely in SW 5.6.

https://redmine.netinventors.de/issues/32206

Edited by Malte Peters

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