With the merge request apache/maven#483 in place the MSHADE-340 test fails.

This very small change fixes this problem.

With this in place the build passes mvn clean verify -Prun-its with both maven 3.8.1 and maven with apache/maven#483 in place.

Following this checklist to help us incorporate your contribution quickly and easily:

• Make sure there is a JIRA issue filed
  for the change (usually before you start working on it). Trivial changes like typos do not
  require a JIRA issue. Your pull request should address just this issue, without
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• Each commit in the pull request should have a meaningful subject line and body.
• Format the pull request title like [MSHADE-XXX] - Fixes bug in ApproximateQuantiles,
  where you replace MSHADE-XXX with the appropriate JIRA issue. Best practice
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