chore(deps): update dependency p-queue to v4 (#433)

Author: renovate[bot]

handwritten/bigtable/package.json

@@ -94,7 +94,7 @@
     "linkinator": "^1.1.2",
     "mocha": "^6.0.0",
     "nyc": "^13.0.0",
-    "p-queue": "^3.0.0",
+    "p-queue": "^4.0.0",
     "power-assert": "^1.4.4",
     "prettier": "^1.7.4",
     "proxyquire": "^2.0.0",