RFR: 7433: Update the spotless maven plugin

[Patrick Reinhart]

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

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Commit messages:
 - 7433: Update the spotless maven plugin

Changes: https://git.openjdk.java.net/jmc/pull/325/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=325&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7433
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/325.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/325/head:pull/325

PR: https://git.openjdk.java.net/jmc/pull/325