RFR: 1497: build: update JUnit to 5.8.2 completely

[Guoxiong Li]

Hi all,

This patch updates JUnit to 5.8.2 completely. The previous patch [1] didn't update file `test/build.gradle`.

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

[1] https://github.com/openjdk/skara/commit/abe48a5d

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Commit messages:
 - SKARA-1497

Changes: https://git.openjdk.org/skara/pull/1340/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1340&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1497
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/skara/pull/1340.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1340/head:pull/1340

PR: https://git.openjdk.org/skara/pull/1340