fix(deps): update dependency nodemailer to v5 (#247)

Author: renovate[bot]

compute/package.json

@@ -17,7 +17,7 @@
     "@google-cloud/compute": "^0.11.0",
     "@sendgrid/mail": "^6.3.1",
     "node-fetch": "^2.3.0",
-    "nodemailer": "^4.3.1",
+    "nodemailer": "^5.0.0",
     "nodemailer-smtp-transport": "^2.7.4"
   },
   "devDependencies": {