Fixes SQS codegen for input serialization for requests to AWS.
Fixes SQS codegen for input serialization for requests to AWS.

rusoto/rusoto,rusoto/rusoto,mattico/rusoto,DualSpark/rust-aws,mthjones/rusoto,rusoto/rusoto,noggleboggle/rusoto,indiv0/rusoto,DualSpark/rust-aws,SecurityInsanity/rusoto,SecurityInsanity/rusoto,DualSpark/rusoto,ford-prefect/rusoto,ford-prefect/rusoto,DualSpark/rusoto,cmsd2/rusoto,DualSpark/rusoto,mattico/rusoto,mattico/rusoto,mthjones/rusoto,DualSpark/rust-aws