RFR: JDK-8321621: Update JCov version to 3.0.16

[Alexandre Iline]

JCov support for byte code version 67.

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Commit messages:
 - JDK-8321621: Update JCov version to 3.0.16

Changes: https://git.openjdk.org/jdk/pull/17041/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17041&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321621
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17041.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17041/head:pull/17041

PR: https://git.openjdk.org/jdk/pull/17041