RFR: 7467: Only use one version of d3

[Marcus Hirt]

Updating v5 to v6.

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Commit messages:
 - 7467: Only use one version of d3

Changes: https://git.openjdk.java.net/jmc/pull/372/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=372&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7467
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jmc/pull/372.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/372/head:pull/372

PR: https://git.openjdk.java.net/jmc/pull/372