Bayesian optimizer tests are stalling

[AlessandroPierro]

Describe the bug The unit tests associated to the Bayesian solvers are stalling.

To reproduce current behavior The stalling tests caused the CI run of the last released to be canceled.

Environment (please complete the following information): Reproduced locally

• Device: Laptop
• OS: WSL2
• Lava version 0.8.0
• Lava optimization versin 0.3.0

[AlessandroPierro]

The issue is related to an incompatibility between numpy 1.23.x and numpy 1.24.x imo, since reverting numpy to 1.23.0 solves the issue.