fix(deps): update slf4j monorepo to v2.0.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.slf4j:slf4j-simple (source, changelog)	2.0.14 -> 2.0.15
org.slf4j:slf4j-api (source, changelog)	2.0.14 -> 2.0.15

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