fix(deps): update dependency mssql to v8

Author: renovate-bot

cloud-sql/sqlserver/mssql/package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@google-cloud/logging-winston": "^4.0.0",
     "express": "^4.17.1",
-    "mssql": "^7.0.0",
+    "mssql": "^8.0.0",
     "prompt": "^1.0.0",
     "pug": "^3.0.0",
     "winston": "^3.1.0"