Bump webpacker from 5.4.2 to 5.4.3 (#16757)

Bump webpacker from 5.4.2 to 5.4.3 (#16757)

Bumps [webpacker](https://github.com/rails/webpacker) from 5.4.2 to 5.4.3.
- [Release notes](https://github.com/rails/webpacker/releases)
- [Changelog](https://github.com/rails/webpacker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rails/webpacker/compare/v5.4.2...v5.4.3)

---
updated-dependencies:
- dependency-name: webpacker
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>