E19: unify the author metadata

The workspace Cargo.toml declared authors = ["Wickra Contributors"]
while the npm package.json and the WASM package.json enrich step in
release.yml both use "kingchenc <kingchencp@gmail.com>".

Make the canonical author "kingchenc <kingchencp@gmail.com>" — the
actual maintainer, already used by both npm packages — and align the
workspace manifest to it. All three registries now agree.

Cargo.toml

@@ -12,7 +12,7 @@ exclude = []
 
 [workspace.package]
 version = "0.1.4"
-authors = ["Wickra Contributors"]
+authors = ["kingchenc <kingchencp@gmail.com>"]
 edition = "2021"
 rust-version = "1.75"
 license = "PolyForm-Noncommercial-1.0.0"