Bump jest from 28.1.3 to 29.4.3 in /examples/amaranth-demo

Bumps [jest](https://github.com/facebook/jest/tree/HEAD/packages/jest) from 28.1.3 to 29.4.3.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v29.4.3/packages/jest)

---
updated-dependencies:
- dependency-name: jest
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/amaranth-demo/package.json

@@ -78,7 +78,7 @@
     "eslint-plugin-testing-library": "^5.5.1",
     "gatsby-cypress": "^2.17.0",
     "gh-pages": "^4.0.0",
-    "jest": "^28.1.1",
+    "jest": "^29.4.3",
     "markdownlint-cli2": "^0.4.0",
     "postcss-syntax": "^0.36.2",
     "prettier": "^2.7.1",