Update to webpack 5

[andreirogobete]

• Updated to webpack 5
• Updated related dependencies (webpack-dev-server, webpack plugins, etc)

Testing Done:

• Ran build locally -> outputs bundle file
• Ran dev locally -> builds
• Ran tests locally -> everything seems to pass

[cloudflare-workers-and-pages[bot]]

Deploying with    Cloudflare Pages

Latest commit:	2c1f1fa
Status:	✅  Deploy successful!
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