Bump log4j-core from 2.18.0 to 2.20.0

Bumps log4j-core from 2.18.0 to 2.20.0.

Commits

• 44ab013 [maven-release-plugin] prepare release log4j-2.20.0-rc1
• ffa25f1 Skip spotless plugin during release
• 7c4e69f [maven-release-plugin] rollback the release of log4j-2.20.0-rc1
• 6825e26 [maven-release-plugin] prepare for next development iteration
• 68d0bab [maven-release-plugin] prepare release log4j-2.20.0-rc1
• 763b844 Revert version update
• c3e8696 [maven-release-plugin] prepare release log4j-2.20.1-rc1
• c541268 [maven-release-plugin] prepare for next development iteration
• 903547c [maven-release-plugin] prepare release log4j-2.20.1-rc1
• 090af6d Add test jars
• Additional commits viewable in compare view

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