RFR: 7562: Make Skara realize master is now 8.3

[Marcus Hirt]

Update for the skara tooling.

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Commit messages:
 - 7562: Make Skara realize master is now 8.3

Changes: https://git.openjdk.java.net/jmc/pull/381/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=381&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7562
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jmc/pull/381.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/381/head:pull/381

PR: https://git.openjdk.java.net/jmc/pull/381