`pqcrypto-sphincsplus` is unmaintained: upstream PQClean project being archived

This crate provides Rust bindings to SPHINCS+/SLH-DSA FIPS 205 via C implementations from PQClean. The PQClean project is being archived in or after July 2026 see PQClean/PQClean604, after which no further security patches or bug fixes will be applied to the upstream implementations. As a result,...