updated pytest docker image

[jmitrevs]

Description

Update the pytest docker image. This updates onnx, qonnx, and uses qkeras from the jmitrevs fork in order to fix a qkeras bug (https://github.com/google/qkeras/pull/133).

Type of change

• [x] Other (Specify) - testing infrastructure

Tests

See if pytests succeed.

Checklist

• [x] I have read the guidelines for contributing.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [x] I have installed and run pre-commit on the files I edited or added.
• [x] I have added tests that prove my fix is effective or that my feature works.