Bump github.com/aws/aws-sdk-go-v2 from 1.18.1 to 1.21.0 (#30)

Bumps [github.com/aws/aws-sdk-go-v2](https://github.com/aws/aws-sdk-go-v2) from 1.18.1 to 1.21.0.
- [Release notes](https://github.com/aws/aws-sdk-go-v2/releases)
- [Commits](aws/aws-sdk-go-v2@v1.18.1...v1.21.0)

---
updated-dependencies:
- dependency-name: github.com/aws/aws-sdk-go-v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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