Update SDK's smithy-go dependency to v1.13.5

Author: AWS SDK for Go v2 automation user

modman.toml

@@ -1,7 +1,7 @@
 
 [dependencies]
  "github.com/aws/aws-sdk-go" = "v1.44.28"
- "github.com/aws/smithy-go" = "v1.13.4"
+ "github.com/aws/smithy-go" = "v1.13.5"
  "github.com/google/go-cmp" = "v0.5.8"
  "github.com/jmespath/go-jmespath" = "v0.4.0"
  "golang.org/x/net" = "v0.1.0"