Bump eslint from 9.9.1 to 9.10.0 in /webapp

Bumps [eslint](https://github.com/eslint/eslint) from 9.9.1 to 9.10.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.9.1...v9.10.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

webapp/package.json

@@ -34,7 +34,7 @@
  "@eslint/js": "^9.5.0",
  "@polymer/test-fixture": "4.0.2",
  "cpy-cli": "5.0.0",
- "eslint": "9.9.1",
+ "eslint": "9.10.0",
  "eslint-plugin-html": "8.1.1",
  "globals": "^15.9.0",
  "wct-browser-legacy": "1.0.2",