Update dependency webpack-bundle-analyzer to ^3.9.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
webpack-bundle-analyzer	devDependencies	minor	^3.9.0	source

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Release Notes

webpack-contrib/webpack-bundle-analyzer

v3.9.0

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• New Feature
  • Adds option reportTitle to set title in HTML reports; default remains date of report generation (#​354 by @​eoingroat)
• Improvement
  • Added capability to parse bundles that have child assets generated (#​376 by @​masterkidan and #​378 by @​https://github.com/dabbott)

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