chore(main): release 3.0.0 (#511)

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

Author: release-please[bot]

container/snippets/package.json

@@ -14,7 +14,7 @@
     "test": "mocha system-test --timeout 1000000"
   },
   "dependencies": {
-    "@google-cloud/container": "^2.6.0",
+    "@google-cloud/container": "^3.0.0",
     "uuid": "^8.3.2"
   },
   "devDependencies": {