RFR: CODETOOLS-7902881: Upgrade to JUnit 4.13.2

[Aleksey Shipilev]

New code would definitely enjoy Assert.assertNotEquals. To get it, we need up-to-date JUnit.

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Commit messages:
 - dos2unix
 - CODETOOLS-7902881: Upgrade to JUnit 4.13.2

Changes: https://git.openjdk.java.net/jcstress/pull/28/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=28&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902881
  Stats: 24 lines in 6 files changed: 0 ins; 0 del; 24 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/28.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/28/head:pull/28

PR: https://git.openjdk.java.net/jcstress/pull/28