Bump aws-sdk from 2.851.0 to 2.856.0 in /setTopicAttributes

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.851.0 to 2.856.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](aws/aws-sdk-js@v2.851.0...v2.856.0)

Signed-off-by: dependabot[bot] <support@github.com>

setTopicAttributes/package.json

@@ -16,7 +16,7 @@
     "dependencies": {
         "@aws-cdk/aws-sns": "^1.60.0",
         "@aws-cdk/core": "^1.60.0",
-        "aws-sdk": "^2.851.0",
+        "aws-sdk": "^2.856.0",
         "ts-custom-error": "^3.2.0"
     },
     "devDependencies": {