fix: fix non-determinism in pdf regression test

[bp1183]

Description

Added a fixed random seed to the test_pdf_to_bioc regression test which prevents inconsistencies in model output causing sporadic test failures.

Fixes #380

Type of change

• Bug fix (non-breaking change which fixes an issue)

Key checklist

• All tests pass (eg. pytest)
• The documentation builds and looks OK (eg. mkdocs)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future. (Indicate issue here: # (issue))

[codecov]

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[Thomas-Rowlands]

So I've spammed re-run on the tests for this PR many times now, not a single failure! LGTM!

[Thomas-Rowlands]

Re-run the tests viciously and relentlessly, its holding up.