[MNT] Remove PyYAML and Cython CI workaround

[amotl]

About

Reassess the legacy CI workaround that prebuilds PyYAML==5.4.1 with a Cython < 3.0 build constraint. PyCaret does not directly import PyYAML or Cython; PyYAML is only included through optional extras.

References

• [MNT] Reassess the PyYAML and Cython CI workaround #39

[fkiraly]

Can you kindly explain why we can simply remove this?

Also, there are merge conflicts with main.

[amotl]

Can you kindly explain why we can simply remove this?

The patch is just probing if we could remove this snippet per CI outcome, and to gather responses from the community that say we shouldn't. Do you have any concerns about removing Cython because of performance regressions?

Also, there are merge conflicts with main.

The PR is stacked on another one and got out of sync. Please don't worry: I don't always keep all things in sync to save CI minutes, but will resolve conflicts before merging, when applicable.

[fkiraly]

Do you have any concerns about removing Cython because of performance regressions?

No, I simply do not have enough information of what the snippet does and what happens if we remove it, that´s all. I was asking for more info.

[amotl]

Let's toggle the patch into draft mode again and wait for @WilliamJudge94 to possibly come up with answers to those details later?