Bump xml2js and @microsoft/sp-build-web in /Demos/02-testing

[dependabot[bot]]

Bumps xml2js to 0.5.0 and updates ancestor dependency @microsoft/sp-build-web. These dependencies need to be updated together.

Updates xml2js from 0.4.23 to 0.5.0

Commits

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Updates @microsoft/sp-build-web from 1.15.2 to 1.17.1

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