chore(deps): update @aws-sdk/client-polly requirement

Updates the requirements on [@aws-sdk/client-polly](https://github.com/aws/aws-sdk-js-v3/tree/HEAD/clients/client-polly) to permit the latest version.
- [Release notes](https://github.com/aws/aws-sdk-js-v3/releases)
- [Changelog](https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-polly/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js-v3/commits/v3.504.0/clients/client-polly)

---
updated-dependencies:
- dependency-name: "@aws-sdk/client-polly"
  dependency-type: direct:production
...

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

package.json

@@ -40,7 +40,7 @@
   },
   "dependencies": {
     "jsftp": "^2.1.3",
-    "@aws-sdk/client-polly": "^3.438.0",
+    "@aws-sdk/client-polly": "^3.504.0",
     "@iobroker/adapter-core": "^3.0.4",
     "google-tts-api": "^2.0.2",
     "axios": "^1.6.0",