Bump eslint from 9.26.0 to 9.31.0 in /webapp

Bumps [eslint](https://github.com/eslint/eslint) from 9.26.0 to 9.31.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.26.0...v9.31.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.31.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

webapp/package.json

@@ -34,7 +34,7 @@
     "@vitejs/plugin-vue": "^5.2.4",
     "@vue/eslint-config-typescript": "^14.5.0",
     "@vue/tsconfig": "^0.7.0",
-    "eslint": "^9.26.0",
+    "eslint": "^9.31.0",
     "eslint-plugin-vue": "^10.1.0",
     "npm-run-all": "^4.1.5",
     "prettier": "^3.5.3",