Add --quiet to the resolver test mvn download

[nikitawootten-nist]

Committer Notes

Very small PR. This change silences the maven download for the resolver pipeline test suite. Currently maven adds several thousand lines of useless output to CI/CD.

Note that the test suite is still in an unstable state (and its output is explicitly ignored in CI/CD). The copy-dependencies step is still a bit of a hack until we can run XSpec tests without having dependencies in a specific place.

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