[JetBrains] Update Platform Version from JetBrains Backend Plugin (EAP)

[roboquat]

Description

This PR updates the Platform Version from JetBrains Backend Plugin (EAP) to the latest version.

How to test

Merge if tests are green, if something breaks then add tests for regressions.

if you want to test manually for some reasons

1. Open the preview environment generated for this branch 2. Choose the _Latest Release (Unstable)_ version of IntelliJ IDEA as your preferred editor 3. Start a workspace using this repository: https://github.com/gitpod-samples/spring-petclinic 4. Verify that the workspace starts successfully 5. Verify that the IDE opens successfully

Release Notes

NONE

Werft options:

• [x] /werft with-preview
• [x] /werft with-large-vm
• [x] /werft with-gce-vm
• [x] with-integration-tests=jetbrains
• [x] latest-ide-version=true

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