problems on M1

When running `poetry run python -m unittest`

I get

```
======================================================================
ERROR: tests.test_plugin (unittest.loader._FailedTest)
----------------------------------------------------------------------
ImportError: Failed to import test module: tests.test_plugin
Traceback (most recent call last):
File "/Users/cjm/opt/anaconda3/envs/oakx-grape-env/lib/python3.9/unittest/loader.py", line 436, in _find_test_path
module = self._get_module_from_name(name)
File "/Users/cjm/opt/anaconda3/envs/oakx-grape-env/lib/python3.9/unittest/loader.py", line 377, in _get_module_from_name
__import__(name)
File "/Users/cjm/repos/oakx-grape/tests/test_plugin.py", line 4, in
from oaklib.implementations import get_implementation_resolver
File "/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/oaklib/__init__.py", line 9, in
from oaklib.selector import get_implementation_from_shorthand # noqa:F401
File "/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/oaklib/selector.py", line 8, in
from oaklib.implementations import GildaImplementation
File "/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/oaklib/implementations/__init__.py", line 28, in
from oaklib.implementations.pronto.pronto_implementation import ProntoImplementation
File "/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/oaklib/implementations/pronto/pronto_implementation.py", line 13, in
import pronto
File "/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/pronto/__init__.py", line 24, in
from .definition import Definition
File "/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/pronto/definition.py", line 5, in
from .xref import Xref
File "/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/pronto/xref.py", line 6, in
import fastobo
ImportError: dlopen(/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/fastobo.cpython-39-darwin.so, 0x0002): tried: '/Users/cjm/Library/Caches/pypoetry/virtualenvs/oakx-grape-pUaGkv-X-py3.9/lib/python3.9/site-packages/fastobo.cpython-39-darwin.so' (mach-o file, but is an incompatible architecture (have (x86_64), need (arm64e)))
```

Start by reproducing the failure with `poetry run python -m unittest` and read `tests/test_plugin.py`, then trace the `oaklib` import through `pronto` to the `fastobo` dependency shown in the traceback. Done means the test suite imports and runs successfully on an Apple M1 environment without the incompatible-architecture error.

Written by the indexing model from the issue text.