tls: use auto-negotiated highest version #3007
Merged
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Specific TLS versions are deprecated in latest Python, which
causes test failures due to treating deprecation errors as
warnings.
Luckily, the fix here is straightforward: we can eliminate some
custom version selection logic by using
PROTOCOL_TLS_CLIENT
,which is the recommended method and will select the highest TLS
version supported by both client and server.