Update scala-xml to 2.0.0

[scala-steward]

Updates org.scala-lang.modules:scala-xml from 1.3.0 to 2.0.0.
GitHub Release Notes - Changelog - Version Diff

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labels: library-update, semver-major

[mbeckerle]

We should delay this until after PR #560 gets reviewed and merged.

The release notes for this new version of scala xml say they have changed the default behavior to "secure" i.e., not allowing doctypes and entities, etc. That's part of what was done in PR 560, but PR 560 also adds tests to verify this, and centralizes loading for uniformity.

[mbeckerle]

This will be done in a separate regular PR that is updating the XML Loading generally.