feat: upgrade dotenv from 15.0.1 to 16.4.5

Snyk has created this PR to upgrade dotenv from 15.0.1 to 16.4.5.

See this package in npm:
dotenv

See this project in Snyk:
https://app.snyk.io/org/cachiman/project/75ced1a4-526a-4dc4-ad4c-e5f7fc20dd25?utm_source=github&utm_medium=referral&page=upgrade-pr

tools/release-posts/package.json

@@ -30,7 +30,7 @@
 		"@woocommerce/monorepo-utils": "workspace:*",
 		"code-analyzer": "workspace:*",
 		"commander": "9.4.0",
-		"dotenv": "^15.0.1",
+		"dotenv": "^16.4.5",
 		"ejs": "^3.1.9",
 		"enquirer": "^2.4.1",
 		"express": "^4.18.2",