[jdk21u] RFR: 8313167: Update to use jtreg 7.3

[Aleksey Shipilev]

Clean backport on the way to match mainline.

Additional testing:
 - [ ] GHA

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Commit messages:
 - Backport 9c6eb67e85e35b3b40c258891789bd3e757a0c17

Changes: https://git.openjdk.org/jdk21u/pull/122/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=122&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313167
  Stats: 11 lines in 8 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk21u/pull/122.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/122/head:pull/122

PR: https://git.openjdk.org/jdk21u/pull/122