Bump webpacker from 4.2.2 to 5.4.0

[dependabot-preview]

Bumps webpacker from 4.2.2 to 5.4.0.

Changelog

Sourced from webpacker's changelog.

[5.4.0] - 2021-05-18

• Fix compatibility with Psych 4

[5.3.0] - 2021-04-27

• 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

[5.2.2] - 2021-04-27

• Bump deps and remove node-sass #2997.

[5.2.1] - 2020-08-17

• Revert #1311.

[5.2.0] - 2020-08-16

• Bump dependencies and fixes. See diff for changes.

[5.1.1] - 2020-04-20

• Update TypeScript documentation and installer to use babel-loader for typescript.[(#2541](rails/webpacker#2541)

[5.1.0] - 2020-04-19

• 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

[5.0.1] - 2020-03-22

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

[5.0.0] - 2020-03-22

• 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']
  }

... (truncated)

Commits

• 272762d 5.4.0
• 7c6e1c2 Minor deps bump
• ceaf826 Fix compatibility with Psych 4
• 34c02ff 5.3.0
• eedd2ab Keep backups, even when they're old. (#2734) (#2912)
• 745837a 5.2.2
• 21e2e6a Bump deps and remove node-sass (#2997)
• 6fbacc8 Merge pull request #2903 from pedrofurtado/5-x-stable
• 27a42bf Update ruby.yml
• b46ce72 Update file.js (#2902)
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

Dependabot will not automatically merge this PR because it includes a major update to a production dependency.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)