Invalid AWS creds can panic

[thomasqueirozb]

smithy-rs/aws/rust-runtime/aws-runtime/src/auth.rs

Line 299 in 2d226ef

let mut value = http_1x::HeaderValue::from_str(header.value()).unwrap();

I hit this by placing all the export AWS_ACCESS_KEY_ID, export AWS_SECRET_ACCESS_KEY, and export AWS_SESSION_TOKEN by placing them into a file and sourcing them - I think something was wrong with them due to CRLF. Can't share these for obvious reasons