housekeeping(deps): [email protected] (via #5483)

Author: renovate[bot]

package-lock.json

@@ -55,7 +55,7 @@
     "classnames": "^2.2.5",
     "core-js": "^2.5.1",
     "css.escape": "1.5.1",
-    "deep-extend": "0.5.1",
+    "deep-extend": "0.6.0",
     "dompurify": "^1.0.4",
     "ieee754": "^1.1.8",
     "immutable": "^3.x.x",