Update log4j.version to v2.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.apache.logging.log4j:log4j-core (source)	2.20.0 -> 2.21.0
org.apache.logging.log4j:log4j-api (source)	2.20.0 -> 2.21.0

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