Update dependency @rails/webpacker to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@rails/webpacker	^4.0.7 -> ^5.0.0

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Release Notes

rails/webpacker (@​rails/webpacker)

v5.4.4

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v5.4.3

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• Specify webpack-dev-server to be v3, to avoid getting webpack-dev-server v4 (#​3121)

v5.4.2

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• Fix babel warning about private-methods in @babel/plugin-proposal-private-property-in-object as well (67fa6edf).

v5.4.1

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• Update all dependencies within the same major version (#​3120)
• Fix babel warning about private-methods (#​3016)

v5.4.0

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• Fix compatibility with Psych 4 (ceaf826d)

v5.3.0

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• Adds experimental Yarn 2 support. Note you must manually set nodeLinker: node-modules in your .yarnrc.yml.
• Keep backups, even when they're old #​2912

v5.2.2

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• Bump deps and remove node-sass #​2997.

v5.2.1

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• Revert #​1311.

v5.2.0

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• Bump dependencies and fixes. See diff for changes.

v5.1.1

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• Update TypeScript documentation and installer to use babel-loader for typescript.(#​2541

v5.1.0

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• Remove yarn integrity check #​2518
• Switch from ts-loader to babel-loader #​2449
  Please see the TypeScript documentation to upgrade existing projects to use typescript with 5.1
• Resolve multi-word snakecase WEBPACKER_DEV_SERVER env values #​2528

v5.0.1

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• Upgrade deps and fix sass loader config options bug #​2508

v5.0.0

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• Bump minimum node version #​2428
• Bump minimum ruby/rails version #​2415
• Add support for multiple files per entry #​2476

  entry: {
    home: ['./home.js', './home.scss'],
    account: ['./account.js', './account.scss']
  }

You can now have two entry files with same names inside packs folder, home.scss and home.js

And, other minor fixes, please see a list of changes here

v4.3.0

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