Manual build failing

[cqc-alec]

See https://github.com/CQCL/pytket/actions/runs/7148621469/job/19469840915

Perhaps due to a quimb update?

[cqc-melf]

The manual build is failing again, not sure if this is the same as above or a new problem, see for example: #316

[cqc-alec]

The manual build is failing again, not sure if this is the same as above or a new problem, see for example: #316

This is the same issue, caused by the update to scipy 1.13: CQCL/tket#1323 will pin scipy to 1.12 in pytket to work around this, and @CalMacCQ is working on a similar fix in pytket-docs so that it works with current pytket.