chore(main): release 5.2.1

[github-actions[bot]]

:robot: I have created a release beep boop

5.2.1 (2024-04-05)

Bug Fixes

• change implementation to be compatible with contao 4 (c4f1de4)

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[github-actions[bot]]

:robot: Release is at https://github.com/cgoIT/contao-calendar-ical-bundle/releases/tag/v5.2.1 :sunflower: