fix(deps): update dependency @google-cloud/security-center to v8 (GoogleCloudPlatform#3445)

Author: renovate-bot

security-center/snippets/package.json

@@ -14,7 +14,7 @@
  "license": "Apache-2.0",
  "dependencies": {
  "@google-cloud/pubsub": "^4.0.0",
- "@google-cloud/security-center": "^7.0.0"
+ "@google-cloud/security-center": "^8.0.0"
  },
  "devDependencies": {
  "c8": "^8.0.0",