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

Author: renovate-bot

package.json

@@ -69,7 +69,7 @@
     "cpy-cli": "2.0.0",
     "cross-env": "7.0.3",
     "enzyme": "3.11.0",
-    "enzyme-adapter-react-16": "1.9.1",
+    "enzyme-adapter-react-16": "1.15.6",
     "gh-pages": "2.2.0",
     "light-ts-loader": "1.1.2",
     "npm-run-all": "4.1.5",