Rollback s2n to re-enable tls13 due to s2n misconfiguration and new feature probe #563
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A feature probe added in v1.4.16 gates TLS13 support. The CRT consumes s2n in a way that makes feature probes unreliable (a separate issue that is being looked into), which means using that version of s2n currently disables tls13 support. By rolling back to v1.4.15, we can unblock CRT releases while we work on the long term s2n configuration issue.
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