chore: bump esmocha (#933)

Author: mshima

package-lock.json

@@ -70,9 +70,10 @@
     "yosay": "^3.0.0"
   },
   "devDependencies": {
+    "@node-loaders/esbuild": "^2.0.0",
     "c8": "^11.0.0",
     "coveralls": "^3.1.1",
-    "esmocha": "^4.0.0",
+    "esmocha": "^5.0.0",
     "globals": "^17.3.0",
     "nock": "^15.0.0",
     "registry-url": "^7.2.0",