Update dependency eslint-plugin-react to v7.12.3 (#297)

Author: renovate[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "eslint-config-wordpress": "2.0.0",
     "eslint-plugin-jest": "22.1.2",
     "eslint-plugin-jsx-a11y": "6.1.2",
-    "eslint-plugin-react": "7.12.2",
+    "eslint-plugin-react": "7.12.3",
     "eslint-plugin-wordpress": "git://github.com/WordPress-Coding-Standards/eslint-plugin-wordpress.git#1774343f6226052a46b081e01db3fca8793cc9f1",
     "har-validator": "5.1.3",
     "husky": "1.3.1",