CertificateRequest Rust bindings (#5331)

Co-authored-by: Sam Clark <3758302+goatgoose@users.noreply.github.com>

Author: Mark-Simulacrum

bindings/rust/extended/s2n-tls/Cargo.toml

@@ -13,6 +13,7 @@ default = []
 unstable-fingerprint = ["s2n-tls-sys/unstable-fingerprint"]
 unstable-ktls = ["s2n-tls-sys/unstable-ktls"]
 unstable-renegotiate = ["s2n-tls-sys/unstable-renegotiate"]
+unstable-cert_authorities = ["s2n-tls-sys/unstable-cert_authorities"]
 quic = ["s2n-tls-sys/quic"]
 fips = ["s2n-tls-sys/fips"]
 pq = ["s2n-tls-sys/pq"]