Update appVersion for 2.4.0 release

[zelinh]

Signed-off-by: Zelin Hao zelinhao@amazon.com

Description

Update appVersion for 2.4.0 release

Issues Resolved

Part of post release activity of https://github.com/opensearch-project/opensearch-build/issues/2649

Check List

• [x] Commits are signed per the DCO using --signoff

For any changes to files within Helm chart directories:

• [ ] Helm chart version bumped
• [ ] Helm chart CHANGELOG.md updated to reflect change

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[zelinh]

We won't merge this PR until our 2.4.0 release launches tomorrow.