Bump python server major version (#4534)

Author: ysaito1001

rust-runtime/aws-smithy-http-server-python/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "aws-smithy-http-server-python"
-version = "0.66.10"
+version = "0.67.0"
 authors = ["Smithy Rust Server <smithy-rs-server@amazon.com>"]
 edition = "2021"
 license = "Apache-2.0"