RFR: 7903578: Update jtreg to bundle JUnit 5.10.2

[Christian Stein]

Please review this change to update jtreg to bundle JUnit 5.10.2.

In addition to bug fixes this version of JUnit does a better job at removing un-interesting frames from assertion error stack traces. See https://junit.org/junit5/docs/current/user-guide/index.html#stacktrace-pruning for details.

Find all changes compared to 5.9.2 listed at [5.10.0](https://junit.org/junit5/docs/current/release-notes/#release-notes-5.10.0), [5.10.1](https://junit.org/junit5/docs/current/release-notes/#release-notes-5.10.1), and [5.10.2](https://junit.org/junit5/docs/current/release-notes/#release-notes-5.10.2).

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Commit messages:
 - 7903578: Update jtreg to bundle JUnit 5.10.2

Changes: https://git.openjdk.org/jtreg/pull/188/files
 Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=188&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903578
  Stats: 3 lines in 2 files changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jtreg/pull/188.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/188/head:pull/188

PR: https://git.openjdk.org/jtreg/pull/188