Bump superagent in /examples/serverless-framework/aws
Bump superagent in /examples/serverless-framework/aws

Bumps [superagent](https://github.com/visionmedia/superagent) from 3.5.2 to 3.8.3.
- [Release notes](https://github.com/visionmedia/superagent/releases)
- [Changelog](https://github.com/visionmedia/superagent/blob/master/HISTORY.md)
- [Commits](https://github.com/visionmedia/superagent/commits/v3.8.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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