[jfx21u] RFR: 8319231: Unrecognized "minimum" key in .jcheck/conf causes /reviewers command to be ignored

[Kevin Rushforth]

Clean backport to jfx21u.

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Commit messages:
 - Backport 72c052ee2ad7b1f74c3c57078917c719d66a9c10

Changes: https://git.openjdk.org/jfx21u/pull/24/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=24&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319231
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx21u/pull/24.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/24/head:pull/24

PR: https://git.openjdk.org/jfx21u/pull/24