ci(SC-2302):update pytest, pytest-qt, pywin32, qt5reactor dependencies

[gordon-epc]

Jira Story

SC-2302

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Associated Pull Requests

• [ ] https://github.com/epcpower/stlib/pull/52
• [ ] _

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[gordon-epc]

Change to pytest 6.2.4 to match the other repos. Cannot go above 6.2.4 due to limitation in typhoontest / Typhoon-HIL-API library.