Bump aws-lamba-java-log4j2 to 1.4.0

[agocs]

What does this PR do?

Bumps the aws-lambda-java-log4j2 dependency to 1.4.0.

aws-lambda-java-log4j2 should have log4j:2.16.0 according to aws/aws-lambda-java-libs#289

Motivation

Testing Guidelines

Additional Notes

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Checklist

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog