RFR: 6907: Upgrade Jacoco to 0.8.6

Mon Feb 8 07:11:53 UTC 2021

Updating to Jacoco 0.8.6

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Commit messages:
 - 6907: Upgrade Jacoco to 0.8.6

Changes: https://git.openjdk.java.net/jmc/pull/214/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=214&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6907
  Stats: 8 lines in 6 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jmc/pull/214.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/214/head:pull/214

PR: https://git.openjdk.java.net/jmc/pull/214