chore(deps): update dependency jest to v25.2.6

Author: renovate-bot

package.json

@@ -66,7 +66,7 @@
     "eslint-plugin-node": "11.1.0",
     "eslint-plugin-promise": "4.2.1",
     "http-server": "0.12.1",
-    "jest": "25.2.4",
+    "jest": "25.2.6",
     "md5.js": "1.3.5",
     "mock-socket": "9.0.3",
     "prettier": "1.19.1",