Bump log4j-core in /buildSrc/src/testKit/thirdPartyAudit (opensearch-…

…project#3762)

Bumps log4j-core from 2.17.2 to 2.18.0.

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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