CIs fail because of a new version of scipy

[Radonirinaunimi]

From v1.14.0, the simps method from scipy.integrate has been removed, causing all the CIs to fail. The packages that depend on scipy are eko and hyperopt, and both of them do not impose a cap on which version should be installed.

Also the arc_lengths function in vp uses simps.

[felixhekhorn]

As eko does not use this function, I don't think eko needs to react, right? #2119 should be a valid fix (PS: the relevant link is this 🙃)

[RoyStegeman]

eko does not use this function

And neither does hyperopt, so indeed #2119 closes this