fix: Fix changelog entry for zustelldienst 1.12.0
Errors in changelog: 
Result in preview environment: https://preview.docs.fitko.dev/fit-connect/fix-changelog-deployment-zsd-1-12-0/docs/changelog#submission-api-1.2.1
Edited by Christoph Metzger
Errors in changelog:
Result in preview environment: https://preview.docs.fitko.dev/fit-connect/fix-changelog-deployment-zsd-1-12-0/docs/changelog#submission-api-1.2.1