pq support: caddy has PQ in beta

[bwesterb]

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[hyperlint-ai]

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PR Change Summary

Added support for Post-Quantum Cryptography (PQC) in Caddy, now available in beta.

• Updated Caddy HTTP server version to 2.10-beta.4+ for PQC support
• Removed outdated Go version requirement for Caddy
• Clarified the list of compatible libraries for PQC

Modified Files

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

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