ssl: fix flaky test case test_ctx_client_session_cb_tls13_exception #1287

Job	Run time
openssl-1.0.2u	50s
openssl-1.1.0l	51s
openssl-1.1.1w	1m 3s
openssl-3.0.15	57s
openssl-3.1.7	57s
openssl-3.2.3	56s
openssl-3.3.2	1m 2s
openssl-3.4.0	1m 3s
openssl-master	3m 44s
libressl-3.1.5	1m 4s
libressl-3.2.7	1m 6s
libressl-3.3.6	1m 0s
libressl-3.4.3	57s
libressl-3.5.3	1m 2s
libressl-3.6.3	59s
libressl-3.7.3	57s
libressl-3.8.4	1m 3s
libressl-3.9.2	57s
libressl-4.0.0	56s
openssl-3.0.15 with fips provider	52s
openssl-3.1.7 with fips provider	51s
openssl-3.2.3 with fips provider	50s
openssl-3.3.2 with fips provider	48s
openssl-3.4.0 with fips provider	51s
openssl-master with fips provider	3m 40s
openssl-3.4.0 without legacy provider	55s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.7	58s
ubuntu-22.04 3.0	1m 1s
ubuntu-22.04 3.1	1m 0s
ubuntu-22.04 3.2	58s
ubuntu-22.04 3.3	58s
ubuntu-22.04 head	1m 3s
ubuntu-22.04 truffleruby	1m 36s
ubuntu-22.04 truffleruby-head	1m 45s
ubuntu-20.04 2.7	1m 2s
ubuntu-20.04 3.0	1m 3s
ubuntu-20.04 3.1	59s
ubuntu-20.04 3.2	1m 4s
ubuntu-20.04 3.3	55s
ubuntu-20.04 head	1m 1s
ubuntu-20.04 truffleruby	1m 30s
ubuntu-20.04 truffleruby-head	1m 45s
macos-latest 2.7	57s
macos-latest 3.0	42s
macos-latest 3.1	36s
macos-latest 3.2	38s
macos-latest 3.3	39s
macos-latest head	40s
macos-latest truffleruby	58s
macos-latest truffleruby-head	1m 2s
windows-latest 2.7	5m 25s
windows-latest 3.0	3m 47s
windows-latest 3.1	3m 52s
windows-latest 3.2	4m 25s
windows-latest 3.3	5m 21s
windows-latest head	3m 42s
windows-latest ucrt	4m 1s
windows-latest mswin	2m 34s
	1h 28m 10s

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