Update dependency nl.jqno.equalsverifier:equalsverifier to v3.15.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nl.jqno.equalsverifier:equalsverifier (source)	3.15.5 -> 3.15.6

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Release Notes

jqno/equalsverifier (nl.jqno.equalsverifier:equalsverifier)

### [`v3.15.6`](https://togithub.com/jqno/equalsverifier/blob/HEAD/CHANGELOG.md#3156---2024-01-09) ##### Fixed - Protected JPA entity getters were ignored. ([Issue 909](https://togithub.com/jqno/equalsverifier/issues/909))

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