Update dependency eslint-plugin-react to v7.12.3

Author: renovate-bot

package-lock.json

@@ -36,7 +36,7 @@
     "eslint-plugin-import": "2.14.0",
     "eslint-plugin-json": "1.3.2",
     "eslint-plugin-jsx-a11y": "6.1.2",
-    "eslint-plugin-react": "7.12.2",
+    "eslint-plugin-react": "7.12.3",
     "eslint-plugin-wpcalypso": "4.0.2",
     "express": "4.16.4",
     "jest": "23.6.0",