Update dependency webpack-bundle-analyzer to v4

This MR contains the following updates:

Package	Type	Update	Change
webpack-bundle-analyzer	dependencies	major	^3.1.0 -> ^4.0.0

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Release Notes

webpack-contrib/webpack-bundle-analyzer

v4.1.0

Compare Source

• Improvement
  • Significantly speed up generation of stats.json file (see generateStatsFile option).

v4.0.0

Compare Source

• Breaking change

  • Dropped support for Node.js 6 and 8. Minimal required version now is v10.13.0

• Improvement

  • Support for Webpack 5

• Bug Fix

  • Prevent crashes when openAnalyzer was set to true in environments where there's no program to handle opening. (#​382 by @​wbobeirne)

• Internal

  • Updated dependencies
  • Added support for multiple Webpack versions in tests

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