[patch] Update npm to v6.14.15 (#121)

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

Author: renovate[bot]

package.json

@@ -41,6 +41,6 @@
   },
   "engines": {
     "node": "^12",
-    "npm": "6.14.14"
+    "npm": "6.14.15"
   }
 }