Bump eslint from 7.8.1 to 7.9.0 in /packages/webapp

Bumps [eslint](https://github.com/eslint/eslint) from 7.8.1 to 7.9.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.8.1...v7.9.0)

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

packages/webapp/package.json

@@ -39,7 +39,7 @@
   "devDependencies": {
     "cypress": "5.1.0",
     "cypress-file-upload": "4.1.1",
-    "eslint": "7.8.1",
+    "eslint": "7.9.0",
     "eslint-config-prettier": "6.11.0",
     "eslint-plugin-cypress": "2.11.1",
     "eslint-plugin-react": "7.20.6",