[R] Stable cookbook build failing on reticulate

[amoeba]

After merging updates to for Arrow 21.0.0 (6ea34bb) the stable cookbooks build is now failing with an error about reticulate.

The build: https://github.com/apache/arrow-cookbook/actions/runs/16559309147/job/46825852299

The failure,

✖ | 1        0 | python [17.1s]
────────────────────────────────────────────────────────────────────────────────
Error ('test-python.R:35:1'): (code run outside of `test_that()`)
<python.builtin.ModuleNotFoundError/python.builtin.ImportError/python.builtin.Exception/python.builtin.BaseException/python.builtin.object/error/condition>
Error in `py_module_import(module, convert = convert)`: ModuleNotFoundError: No module named 'pyarrow'
Run `reticulate::py_last_error()` for details.
Backtrace:
    ▆
 1. └─reticulate::import("pyarrow") at test-python.R:35:1
 2.   └─reticulate:::py_module_import(module, convert = convert)
────────────────────────────────────────────────────────────────────────────────

[amoeba]

I don't have the brain power tonight to figure this out but will try to get to it soon. If anyone wants to jump on this feel free.

[amoeba]

Looks like #386 fixed it.