Bump org.codehaus.plexus:plexus-utils in /log4j-parent (#3299)

Bumps [org.codehaus.plexus:plexus-utils](https://github.com/codehaus-plexus/plexus-utils) from 3.5.1 to 3.6.0.
- [Release notes](https://github.com/codehaus-plexus/plexus-utils/releases)
- [Commits](codehaus-plexus/plexus-utils@plexus-utils-3.5.1...plexus-utils-3.6.0)

---
updated-dependencies:
- dependency-name: org.codehaus.plexus:plexus-utils
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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