Fixed the API endpoint URL for Route 53.
Fixed the API endpoint URL for Route 53.

DualSpark/rust-aws,rusoto/rusoto,SecurityInsanity/rusoto,mattico/rusoto,DualSpark/rust-aws,rusoto/rusoto,SecurityInsanity/rusoto,mattico/rusoto,DualSpark/rust-aws,DualSpark/rusoto,DualSpark/rusoto,mattico/rusoto,DualSpark/rusoto,rusoto/rusoto