Fix NumPy 2 incompatibility by bumping matplotlib pin#18
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Follow-up to #17.
After the NumPy 2 compatibility fixes were merged, the CI (Git Actions) build on main started failing at the pytest step (exit code 2 — a collection error, before any test runs).
Cause: #17 relaxed the numpy<2.0.0 pin, so CI now resolves NumPy 2.x on Python 3.10. But requirements.txt still pinned matplotlib==3.5.1, which was based on NumPy 1.x.
Under NumPy 2 the matplotlib import raises the "compiled using NumPy 1.x cannot be run in NumPy 2.x" error.
Fix: Bump the pin to matplotlib>=3.8.4, the first release with wheels ABI-compatible with both NumPy 1.x and 2.x (still supports Python 3.10).
Local testing: New virtual env on Python 3.10 replicating the CI install steps; resolves to numpy 2.2.6 + matplotlib 3.10.9, and the full suite passes (31 passed).