Update dependency enzyme-adapter-react-16 to v1.15.6 (#16)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package.json

@@ -45,7 +45,7 @@
     "@typescript-eslint/eslint-plugin": "2.34.0",
     "@typescript-eslint/parser": "2.34.0",
     "enzyme": "^3.11.0",
-    "enzyme-adapter-react-16": "^1.15.2",
+    "enzyme-adapter-react-16": "1.15.6",
     "enzyme-to-json": "^3.4.4",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "6.15.0",