Update logback.version to v1.5.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ch.qos.logback:logback-core (source, changelog)	1.5.3 -> 1.5.6
ch.qos.logback:logback-classic (source, changelog)	1.5.3 -> 1.5.6

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