⬆ upgrade dependency org.mnode.ical4j:ical4j to v4.0.0-beta6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.mnode.ical4j:ical4j (source)	4.0.0-beta5 -> 4.0.0-beta6

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