Pin NumPy below v2 for 3.7.x

[QuLogic]

PR summary

Pre-emptively pinning away from the major API break for the last bugfix release of the 3.7.x series.

PR checklist

• [n/a] "closes #0000" is in the body of the PR description to link the related issue
• [n/a] new and changed code is tested
• [n/a] Plotting related features are demonstrated in an example
• [n/a] New Features and API Changes are noted with a directive and release note
• [n/a] Documentation complies with general and docstring guidelines

[timhoffm]

Failed test is a subprocess timeout and unrelated to numpy pinning.

Note that this is not a full protection against getting broken environments because earlier matplotlib versions are unpinnend, and the solver may choose to downgrade to matplotlib 3.7.2 to be able to use numpy=2. Anyway, pinning now is better than not doing anything.