Update dependency enzyme-adapter-react-16 to v1.15.6

Author: renovate-bot

package.json

@@ -97,7 +97,7 @@
     "cross-env": "7.0.3",
     "css-loader": "3.6.0",
     "enzyme": "3.11.0",
-    "enzyme-adapter-react-16": "1.15.5",
+    "enzyme-adapter-react-16": "1.15.6",
     "eslint": "7.18.0",
     "eslint-config-airbnb": "18.2.1",
     "eslint-config-prettier": "7.2.0",