RFR: 7434: Update the maven download plugin

[Patrick Reinhart]

Signed-off-by: Patrick Reinhart <patrick at reini.net>

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Commit messages:
 - 7434: Update the maven download plugin

Changes: https://git.openjdk.java.net/jmc/pull/326/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=326&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7434
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/326.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/326/head:pull/326

PR: https://git.openjdk.java.net/jmc/pull/326