test: fix @types/node version in tests re: #12297

Author: vkarpov15

package.json

@@ -39,6 +39,7 @@
     "@babel/preset-env": "7.10.4",
     "@typescript-eslint/eslint-plugin": "4.10.0",
     "@typescript-eslint/parser": "4.10.0",
+    "@types/node": "16.x",
     "acquit": "1.x",
     "acquit-ignore": "0.1.x",
     "acquit-require": "0.1.x",