chore(deps-dev): bump eslint from 9.19.0 to 9.21.0 in /web

Bumps [eslint](https://github.com/eslint/eslint) from 9.19.0 to 9.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.19.0...v9.21.0)

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

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

Author: dependabot[bot]

web/package.json

@@ -30,7 +30,7 @@
     "@types/node": "^22.13.0",
     "@types/react": "^18.3.18",
     "@types/react-dom": "^19.0.1",
-    "eslint": "^9.19.0",
+    "eslint": "^9.21.0",
     "eslint-config-next": "15.2.0",
     "eslint-plugin-primer-react": "^6.1.6",
     "typescript": "^5.7.3"