Upgrade some frontend tools

• eslint: Upgrade to version 9.x

  It implied the migration of the eslint configuration files to the new flat format (thanks to the eslint-migrate-config CLI tool).

• webpack: Replace OptimizeCSSAssetsPlugin by CssMinimizerPlugin

  OptimizeCSSAssetsPlugin is no longer maintained and must be replaced by CssMinimizerPlugin.

Jenkins job DWAPPS/gitlab-builds #876 succeeded .
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added 3 commits

• 77d4fe81 - eslint: Upgrade to version 9.x
• 5671cc0a - webpack: Replace OptimizeCSSAssetsPlugin by CssMinimizerPlugin
• aea54386 - package.json: Bump dependencies

Compare with previous version

Jenkins job DWAPPS/gitlab-builds #877 succeeded .
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merged