fix(deps): roll back dependency @google-cloud/security-center to ^5.0.3 (#319)

Author: renovate-bot

packages/google-cloud-securitycenter/samples/package.json

@@ -14,7 +14,7 @@
   "license": "Apache-2.0",
   "dependencies": {
     "@google-cloud/pubsub": "^2.0.0",
-    "@google-cloud/security-center": "^5.1.0"
+    "@google-cloud/security-center": "^5.0.3"
   },
   "devDependencies": {
     "chai": "^4.2.0",