RFR: 7903499: Update various versions used by jtreg's IDEA plugin [v2]

[Christoph]

> This enables building the plugin with never java versions
> 
> I tested with IntelliJ 2023.1.2 and java 17 and 19
> 
> Plugin still works

Christoph has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Merge branch 'master' into updateJtregGradlePlugin
 - update to 7.6.1 and add checkstum
   revert exec bit
 - update plugin version to latest
 - fix typo
 - Merge remote-tracking branch 'upstream/master' into updateJtregGradlePlugin
   
   * upstream/master:
     7903469: Update JCommander to version 1.82
 - change path back to default
 - Update plugin for intellij 2023

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Changes: https://git.openjdk.org/jtreg/pull/157/files
 Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=157&range=01
  Stats: 227 lines in 7 files changed: 109 ins; 43 del; 75 mod
  Patch: https://git.openjdk.org/jtreg/pull/157.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/157/head:pull/157

PR: https://git.openjdk.org/jtreg/pull/157