[intellij] Update IDE image to build version 242.21829.142

[github-actions]

Description

This PR updates the IntelliJ IDEA IDE image to the latest release version.

How to test

1. Open the preview environment generated for this branch
2. Choose the stable version of IntelliJ IDEA as your preferred editor
3. Start a workspace using this repository: https://github.com/gitpod-io/spring-petclinic
4. Verify that the workspace starts successfully
5. Verify that the IDE opens successfully
6. Verify that the version of the IDE corresponds to the one being updated in this PR

The following resources should help, in case something goes wrong (e.g. workspaces don't start):

• https://www.gitpod.io/docs/troubleshooting#gitpod-logs-in-jetbrains-gateway
• https://docs.google.com/document/d/1K9PSB0G6NwX2Ns_SX_HEgMYTKYsgMJMY2wbh0p6t3lQ

Release Notes

Update IntelliJ IDEA IDE image to version 242.21829.142.

This PR was created automatically with GitHub Actions using this template