RFR: 8334036: Update JCov for class file version 68

[Alexandre Iline]

Update JCov for class file version 68

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Commit messages:
 - JDK-8334036: Update JCov for class file version 68

Changes: https://git.openjdk.org/jdk/pull/19665/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19665&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334036
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19665.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19665/head:pull/19665

PR: https://git.openjdk.org/jdk/pull/19665