Replace deprecated ssl.PROTOCOL_TLS in pki/client.py #4231

Job	Run time
Initialization / Initializing workflow	5s
Waiting for build / Waiting For Build	9m 14s
Waiting for build / Waiting For Build - 2nd attempt	0s
Basic CA / Test	5m 13s
CA with RSA/PSS / Test	3m 10s
CA with ECC / Test	3m 13s
CA with CMC shared token / Test	4m 0s
CA with existing certs / Test	3m 35s
CA admin user / Test	4m 26s
CA with existing DS / Test	3m 14s
CA container / Test	2m 44s
CA connection with DS / Test	6m 39s
CA with existing HSM / Test	5m 8s
CA with existing NSS database / Test	3m 42s
CA with HSM / Test	4m 49s
CA with non-default user / Test	3m 8s
CA with Nuxwdog / Test	5m 37s
CA database pruning / Test	9m 44s
CA with RSNv1 / Test	4m 31s
CA with Sequential Serial Numbers / Test	5m 1s
	1h 27m 13s

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