[boost] Remove port version constraints

[JavierMatosD]

This PR removes port version constraints from boost ports.

I can add the port version constraints for specific ports if there is a well-understood specific requirement for that port.

Tagging @Neumann-A since you tend to work on the boost ports.

Feedback is welcome :)

This is needed for #30836 to land.

[Neumann-A]

Tagging @Neumann-A since you tend to work on the boost ports.

Not really. I basically never updated them as far as I remember. I just fixed the synchro and renaming stuff. The port version constrain probably automatically kicks in by the baseline? Is there a reason to not or to have them? You definetly will need them for the synchro update.

[Osyotr]

I guess the problem is that a change in one port requires making changes in a lot of other ports.
In practice nobody bothered update other ports so this change is ok.
What about moving dependencies from boost metaport to features and adding port version constraints to them?