Python 3.13 support

[janosh]

tensorpotential cannot be installed on the latest Python

uv pip install tensorpotential

throws

  × No solution found when resolving dependencies:
  ╰─▶ Because only the following versions of tensorflow are available:
      and tensorflow<=2.16.2 has no wheels with a matching Python ABI tag (e.g., `cp313`),
      we can conclude that tensorflow<=2.16.2 cannot be used.
      And because all versions of tensorpotential depend on tensorflow<2.17 and you
      require tensorpotential, we can conclude that your requirements are unsatisfiable.

      hint: You require CPython 3.13 (`cp313`), but we only found wheels for `tensorflow`
      (v2.16.2) with the following Python ABI tags: `cp39`, `cp310`, `cp311`, `cp312`

not urgent and looks like it's blocked by tensorflow/tensorflow#78774 anyway