[jdk21u] RFR: 8314495: Update to use jtreg 7.3.1 [v2]

Tue Sep 5 14:30:15 UTC 2023

> Unclean backport to bring jtreg version in alignment with mainline. The uncleanliness comes from contextual difference re gtest version in the adjacent hunks.
> 
> Additional testing:
>  - [x] GHA

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  Backport c50315de8f13d316a7de08be53716cd88fa801c4

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Changes: https://git.openjdk.org/jdk21u/pull/123/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=123&range=01
  Stats: 9 lines in 8 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u/pull/123.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/123/head:pull/123

PR: https://git.openjdk.org/jdk21u/pull/123