RFR: 7903469: Update JCommander to version 1.82

[Christian Stein]

Please review this change updating the version of JCommander to `1.8.2`.

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Commit messages:
 - 7903469: Update JCommander to version 1.82

Changes: https://git.openjdk.org/jtreg/pull/154/files
 Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=154&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903469
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jtreg/pull/154.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/154/head:pull/154

PR: https://git.openjdk.org/jtreg/pull/154