[JetBrains] Update IDE images to new build version

Author: roboquat

components/ide/jetbrains/backend-plugin/gradle-stable.properties

@@ -2,7 +2,7 @@
 # See https://plugins.jetbrains.com/docs/intellij/build-number-ranges.html
 # for insight into build numbers and IntelliJ Platform versions.
 # revert pluginSinceBuild if it's unnecessary
-pluginSinceBuild=242.19533
+pluginSinceBuild=242.21829
 pluginUntilBuild=242.*
 # Plugin Verifier integration -> https://github.com/JetBrains/gradle-intellij-plugin#plugin-verifier-dsl
 # See https://jb.gg/intellij-platform-builds-list for available build versions.