Fix import.

Author: lohedges

tests/runner/test_repex.py

@@ -8,7 +8,7 @@
 from somd2.runner._base import RunnerBase
 from somd2.config import Config
 
-from conftest import has_cuda
+from tests.conftest import has_cuda
 
 
 @pytest.mark.skipif(not has_cuda, reason="CUDA not available.")