[ROCm] Build plugin wheels for all tested Python versions
Expand the ROCm build matrix to produce jax-rocm-plugin wheels for
Python 3.11, 3.12, 3.13, and 3.14, matching the versions tested by
the nightly workflow. The jax-rocm-pjrt wheel is Python-agnostic
(py3-none) so it is only built once.
