RFR: CODETOOLS-7903049: jcstress: Reconsider tested JDK versions

[Aleksey Shipilev]

With the release of JDK 17, we need to reconsider tested versions in GHA.

-------------

Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jcstress/pull/101/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=101&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903049
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/101.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/101/head:pull/101

PR: https://git.openjdk.java.net/jcstress/pull/101