[MNT] Remove <3.13 bound from mapie in all_extras

[Mushfiqur719]

Reference Issues/PRs

Partially resolves #478.

What does this implement/fix? Explain your changes.

This PR removes the python_version < "3.13" bound from the MAPIE optional dependency in the all_extras section of pyproject.toml.

Previously, MAPIE was restricted to Python versions below 3.13:

"mapie; python_version < '3.13'"

This PR updates the dependency specification to:

"mapie"

The goal is to gradually remove <3.13 bounds from optional dependencies as Python 3.13 and NumPy 2 become supported across the ecosystem, as discussed in #478.

Verification

The change was tested locally using a Python 3.13 environment.

Does your contribution introduce a new dependency? If yes, which one?

No.

This PR only removes the Python version bound from an existing soft dependency.

What should a reviewer concentrate their feedback on?

• correctness of the dependency change in pyproject.toml
• confirmation that removing the Python 3.13 bound for MAPIE is safe

Did you add any tests for the change?

No new tests were added.

Existing MAPIE-related tests in the repository were executed to confirm compatibility with Python 3.13.

Any other comments?

This PR follows the incremental approach suggested in #478 by unlocking dependencies one at a time.
Further dependencies (e.g., lifelines, ngboost, pymc) can be addressed in separate PRs after verification.

PR checklist

For all contributions

• I've added myself to the list of contributors
• The PR title starts with either [ENH], [MNT], [DOC], or [BUG].

For new estimators

• I've added the estimator to the API reference
• I've added illustrative examples to the docstring
• I've set soft dependency tags where required

[fkiraly]

This PR includes merge conflicts in the documentation and breaks it.