Update @babel/preset-env requirement in /packages/worker

Updates the requirements on [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) to permit the latest version.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.28.5/packages/babel-preset-env)

---
updated-dependencies:
- dependency-name: "@babel/preset-env"
  dependency-version: 7.28.5
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/worker/package.json

@@ -18,7 +18,7 @@
 		"marked": "^16.0.0"
 	},
 	"devDependencies": {
-		"@babel/preset-env": "^7.27.2",
+		"@babel/preset-env": "^7.28.5",
 		"@cloudflare/vitest-pool-workers": "^0.8.47",
 		"@cloudflare/workers-types": "^4.20250628.0",
 		"@eslint/js": "^9.30.0",