build(deps): bump github.com/aws/aws-sdk-go from 1.42.20 to 1.42.21

Bumps [github.com/aws/aws-sdk-go](https://github.com/aws/aws-sdk-go) from 1.42.20 to 1.42.21.
- [Release notes](https://github.com/aws/aws-sdk-go/releases)
- [Changelog](https://github.com/aws/aws-sdk-go/blob/main/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-go/compare/v1.42.20...v1.42.21)

go.mod

@@ -5,7 +5,7 @@ go 1.17
 require (
 	github.com/alecthomas/kong v0.2.20
 	github.com/apex/log v1.9.0
-	github.com/aws/aws-sdk-go v1.42.20
+	github.com/aws/aws-sdk-go v1.42.21
 	github.com/stretchr/testify v1.7.0
 	gitlab.com/unboundsoftware/apex-mocks v0.0.4
 )