RFR: Upgrade to JUnit 4.13.2

[Henri Tremblay]

Upgrade to JUnit 4.13.2

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Commit messages:
 - Upgrade to JUnit 4.13.2

Changes: https://git.openjdk.java.net/jmh/pull/24/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmh&pr=24&range=00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmh/pull/24.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/24/head:pull/24

PR: https://git.openjdk.java.net/jmh/pull/24