crypto/tls: enforce TLS 1.3 (and TLS 1.2) downgrade protection checks Fixes #37763 Change-Id: Ic6bcc9af0d164966f4ae31087998e5b546540038 Reviewed-on: https://go-review.googlesource.com/c/go/+/231038 Run-TryBot: Filippo Valsorda <filippo@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Katie Hockman <katie@golang.org>
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