Fix cuda-version pin lag breaking local pixi run test

The bindings were regenerated against CUDA 13.3.0 (cc50515), adding NVRTC
symbols (NVRTC_ERROR_BUSY, nvrtcBundledHeadersInfo, nvrtcGetBundledHeadersInfo),
but the pixi cuda-version pins stayed at 13.2 in cuda_bindings/pixi.toml and
cuda_core/pixi.toml. `pixi run test` then built 13.3-referencing Cython code
against a 13.2 nvrtc.h and failed with "'nvrtcBundledHeadersInfo' was not
declared in this scope". CI was unaffected because it builds wheels from
ci/versions.yml (13.3.0) rather than via pixi run test.

Bump the cuda-version pins (build-variants + feature.cu13) from 13.2.* to
13.3.* in both packages so the local toolkit matches the regenerated sources
and ci/versions.yml. Re-solved pixi.lock files accordingly.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rparolin