fix(deps): update dependency @google-cloud/bigquery to v2

Author: renovate[bot]

functions/sendgrid/package.json

@@ -15,7 +15,7 @@
     "test": "ava -T 20s --verbose test/*.test.js"
   },
   "dependencies": {
-    "@google-cloud/bigquery": "0.12.0",
+    "@google-cloud/bigquery": "2.0.3",
     "@google-cloud/storage": "1.7.0",
     "safe-buffer": "5.1.2",
     "sendgrid": "5.2.3",