[3.0] Update netty to 4.1.115.Final to fix CVE-2024-47535

[mattwong949]

Update netty to 4.1.115.Final to fix CVE-2024-47535

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[confluent-cla-assistant]

🎉 All Contributor License Agreements have been signed. Ready to merge.
_{Please push an empty commit if you would like to re-run the checks to verify CLA status for all contributors.}