chore(main): release 4.3.0 (#429)

* chore(main): release 4.3.0

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

container-analysis/snippets/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 100000 test/**.test.js"
   },
   "dependencies": {
-    "@google-cloud/containeranalysis": "^4.2.0",
+    "@google-cloud/containeranalysis": "^4.3.0",
     "@google-cloud/pubsub": "^3.0.0",
     "p-retry": "^4.1.0"
   },