[jfx17u] RFR: 8274274: Update JUnit to version 5.8.1

[Kevin Rushforth]

Clean backport to `jfx17u`.

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Commit messages:
 - 8274274: Update JUnit to version 5.8.1

Changes: https://git.openjdk.java.net/jfx17u/pull/58/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx17u&pr=58&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274274
  Stats: 161 lines in 5 files changed: 151 ins; 3 del; 7 mod
  Patch: https://git.openjdk.java.net/jfx17u/pull/58.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx17u pull/58/head:pull/58

PR: https://git.openjdk.java.net/jfx17u/pull/58