[electrum] fix pyopenssl version

Summary:
We bumped cryptography in D17790, which caused a version conflict with the PyOpenSsl requirements. Bump pyopenssl so it accepts cryptography 43.x

Fixes the MacOS build.

Partial backport of electroncash#2933

Test Plan: build the mac os releasse

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D17823