All tutorials should drop use of emcee_pt

[ahnitz]

@cdcapano I think this is something both of us will need to handle, but the inference tutorials need to drop emcee_pt so that we can get them working on python3.12 and newer. I think we've reached the point we can't carry that sampler futher than this.

This is a blocking issue for gwastro/pycbc#4716