chore(deps): bump league/flysystem-aws-s3-v3 from 3.16.0 to 3.21.0

Bumps [league/flysystem-aws-s3-v3](https://github.com/thephpleague/flysystem-aws-s3-v3) from 3.16.0 to 3.21.0.
- [Commits](thephpleague/flysystem-aws-s3-v3@3.16.0...3.21.0)

---
updated-dependencies:
- dependency-name: league/flysystem-aws-s3-v3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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