ci: integration tests are flaky

[jmayclin]

Problem:

Integration tests are flaky. On the two failures that I observed, both were reporting failures for this test case.

FAILED test_happy_path.py::test_s2n_client_happy_path[RSA_1024_SHA384-TLS1.2-P-384-GnuTLS-ECDHE-RSA-AES256-SHA384]

Solution:

Unknown.

[jmayclin]

Also saw a failure with

FAILED test_renegotiate.py::test_s2n_client_renegotiate_with_app_data_with_openssl[OpenSSL-TLS1.0-RSA_4096_SHA256-P-521-DHE-RSA-AES256-SHA]

[jmayclin]

FAILED test_renegotiate.py::test_s2n_client_renegotiate_with_app_data_with_openssl[OpenSSL-TLS1.0-RSA_4096_SHA256-P-521-AES256-SHA]

#4636 , on the first CI run: codebuild log link