Bump log4j-core from 2.15.0 to 2.16.0

[cla-checker-service[bot]]

💚 CLA has been signed

[apmmachine]

:grey_exclamation: Build Aborted

The PR is not allowed to run in the CI yet

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#### Build stats * Reason: `The PR is not allowed to run in the CI yet` * Start Time: 2021-12-14T04:07:51.502+0000 * Duration: 3 min 25 sec * Commit: fab3988b820205ca17530cc100c6c6d8fee3f677

:robot: GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[apmmachine]

:broken_heart: Build Failed

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#### Build stats * Start Time: 2021-12-14T08:01:30.948+0000 * Duration: 3 min 8 sec * Commit: fab3988b820205ca17530cc100c6c6d8fee3f677

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##### `Git fetch`

• Took 0 min 5 sec . View more details here
• Description: git fetch https://${GIT_USERNAME}:${GIT_PASSWORD}@github.com/elastic/ecs-logging-java.git +refs/pull/*/head:refs/remotes/origin/pr/* > fetch.log 2>&1

##### `Archive the artifacts`

• Took 0 min 2 sec . View more details here
• Description: fetch.log

:robot: GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)