fix sigv4 canonical request order and revamp test suite

.changelog/1753460364.md

@@ -0,0 +1,13 @@
+---
+applies_to:
+- aws-sdk-rust
+- client
+authors:
+- aajtodd
+references:
+- smithy-rs#4227
+breaking: false
+new_feature: false
+bug_fix: true
+---
+Fix canonical request sort order

aws/rust-runtime/aws-sigv4/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "aws-sigv4"
-version = "1.3.3"
+version = "1.3.4"
 authors = ["AWS Rust SDK Team <[email protected]>", "David Barsky <[email protected]>"]
 description = "SigV4 signer for HTTP requests and Event Stream messages."
 edition = "2021"
@@ -43,7 +43,7 @@ aws-credential-types = { path = "../aws-credential-types", features = ["test-uti
 aws-smithy-runtime-api = { path = "../../../rust-runtime/aws-smithy-runtime-api", features = ["client", "test-util"] }
 bytes = "1"
 hex-literal = "0.4.1"
-httparse = "1.8"
+httparse = "1.10.1"
 pretty_assertions = "1.3"
 proptest = "1.2"
 serde = "1.0.180"