RFR: 7432: Update the spotbugs maven plugin [v6]

[Patrick Reinhart]

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

Patrick Reinhart has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  7432: Update the spotbugs maven plugin
  
  Signed-off-by: Patrick Reinhart <patrick at reini.net>

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/324/files
  - new: https://git.openjdk.java.net/jmc/pull/324/files/d21e62cb..21a20fb1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=324&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=324&range=04-05

  Stats: 7 lines in 1 file changed: 3 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jmc/pull/324.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/324/head:pull/324

PR: https://git.openjdk.java.net/jmc/pull/324