build(deps-dev): bump @sa11y/jest from 5.3.0 to 6.0.0 (#872)

Bumps [@sa11y/jest](https://github.com/salesforce/sa11y/tree/HEAD/packages/jest) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/salesforce/sa11y/releases)
- [Changelog](https://github.com/salesforce/sa11y/blob/master/CHANGELOG.md)
- [Commits](https://github.com/salesforce/sa11y/commits/v6.0.0/packages/jest)

---
updated-dependencies:
- dependency-name: "@sa11y/jest"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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package.json

@@ -35,7 +35,7 @@
     "devDependencies": {
         "@lwc/eslint-plugin-lwc": "^1.6.4",
         "@prettier/plugin-xml": "^3.2.2",
-        "@sa11y/jest": "^5.3.0",
+        "@sa11y/jest": "^6.0.0",
         "@salesforce/eslint-config-lwc": "^3.5.2",
         "@salesforce/eslint-plugin-aura": "^2.1.0",
         "@salesforce/eslint-plugin-lightning": "^1.0.0",