Bump pixi.js-legacy from 6.1.3 to 7.4.3

Bumps [pixi.js-legacy](https://github.com/pixijs/pixijs) from 6.1.3 to 7.4.3.
- [Release notes](https://github.com/pixijs/pixijs/releases)
- [Commits](pixijs/pixijs@v6.1.3...v7.4.3)

---
updated-dependencies:
- dependency-name: pixi.js-legacy
  dependency-version: 7.4.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]