RFR: CODETOOLS-7903006: Upgrade jtreg plugin to IntelliJ 2021.2

[Maurizio Cimadamore]

On Wed, 4 Aug 2021 06:07:55 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Hi,
> 
> could we update target platform version to 21.2?
> 
> There were no issues with the build, plugin works fine (IntelliJ 2021.2 on Ubuntu x64).
> 
> Thanks, Thomas

Isn't this a dup of https://git.openjdk.java.net/jtreg/pull/19 ?

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PR: https://git.openjdk.java.net/jtreg/pull/20