chore(main): release 0.4.0#67

hashemix merged 1 commit intomainrust-mcp-stack/rust-mcp-schema:mainfrom

release-please--branches--main--components--rust-mcp-schemarust-mcp-stack/rust-mcp-schema:release-please--branches--main--components--rust-mcp-schemaCopy head branch name to clipboard