[SSL] Add openssl-3.5.0-alpha, zig-0.14.0, gnutls to pqc-support.mdx (#20534)

Author: sgvictorino

src/content/docs/ssl/post-quantum-cryptography/pqc-support.mdx

@@ -21,13 +21,18 @@ The list below is for reference only. Responsibility for third-party software li
 - Default for recent [Opera](https://opera.com) and [Brave](https://brave.com)
 - Cloudflare's [fork of Go](https://github.com/cloudflare/go)
 - Default for [Go 1.24+](https://go.dev/doc/go1.24#cryptotlspkgcryptotls)
+- [OpenSSL 3.5.0+](https://www.openssl.org/) (Alpha)
 - [BoringSSL](https://boringssl.googlesource.com/boringssl/)
+- [GnuTLS](https://www.gnutls.org)
+    - 3.8.9+ compiled with leancrypto 1.2.0+
+    - 3.8.8+ compiled with liboqs 0.11.0+
 - [rustls 0.23.22+](https://crates.io/crates/rustls)
 - Default for [rpxy 0.9.4+](https://github.com/junkurihara/rust-rpxy)
 - [NGINX](https://github.com/nginx/nginx) compiled with OpenSSL 3.5+ ([instructions](https://github.com/nginx/nginx/issues/288))
 - [Open Quantum Safe](https://openquantumsafe.org/)
     - C library: liboqs 0.10.0+
     - OpenSSL provider: oqs-provider 0.7.0+
+- [Zig 0.14.0+](https://ziglang.org/)
 - [Caddy HTTP server](https://caddyserver.com/) nightly compiled with Go 1.24+ ([instructions](https://gist.github.com/bwesterb/2f7bfa7ae689de0d242b56ea3ecac424))
 - [Botan C++ library 3.7.0+](https://botan.randombit.net/)
 
@@ -41,6 +46,9 @@ The list below is for reference only. Responsibility for third-party software li
 - Cloudflare's [fork of Go](https://github.com/cloudflare/go)
 - Default for [Go 1.23](https://github.com/golang/go/issues/67061)
 - [BoringSSL](https://boringssl.googlesource.com/boringssl/)
+- [GnuTLS](https://www.gnutls.org)
+    - 3.8.8+ compiled with liboqs 0.11.0-0.12.0
+    - 3.8.7 compiled with liboqs 0.10.1-0.12.0
 - Cloudflare's [fork of QUIC-go](https://github.com/cloudflare/qtls-pq)
 - Goutam Tamvada's [fork of Firefox](https://github.com/xvzcf/firefox-pq-demos)
 - [Open Quantum Safe](https://openquantumsafe.org/)