Add dtls1.3 to ssl_protocol_to_string() #34

Job	Run time
run-checker (no-cmp)	1m 45s
run-checker (no-cms)	1m 49s
run-checker (no-dgram)	1m 42s
run-checker (no-dh)	1m 38s
run-checker (no-dtls)	2m 37s
run-checker (no-ec)	1m 36s
run-checker (no-ec2m)	1m 43s
run-checker (no-ecx)	2m 20s
run-checker (no-http)	1m 48s
run-checker (no-legacy)	1m 58s
run-checker (no-sock)	1m 40s
run-checker (enable-ssl-trace)	1m 58s
run-checker (no-threads)	1m 43s
run-checker (no-thread-pool)	1m 38s
run-checker (no-default-thread-pool)	1m 37s
run-checker (no-tls)	1m 40s
run-checker (no-tls1_2)	1m 42s
run-checker (no-tls1_3)	1m 43s
run-checker (enable-trace enable-fips)	1m 42s
run-checker (no-ui)	1m 37s
run-checker (no-quic)	1m 49s
	37m 45s

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