Bump prettier from 2.1.1 to 2.1.2 in /packages/webapp

Bumps [prettier](https://github.com/prettier/prettier) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.1.1...2.1.2)

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

packages/webapp/package.json

@@ -44,7 +44,7 @@
     "eslint-plugin-react": "7.20.6",
     "husky": "4.3.0",
     "lint-staged": "10.4.0",
-    "prettier": "2.1.1"
+    "prettier": "2.1.2"
   },
   "keywords": [
     "sia",