pyproject.toml: add search path for Pyrefly

This allows pyrefly to locate `numba.cuda` code within the `numba_cuda`
package instead of in the installed Numba package. With this change,
using Pyrefly as an LSP behaves "as expected" - i.e. suggestions / info
based on code in `numba_cuda` are provided instead of those from the
legacy upstream CUDA target.

Author: gmarkall

pyproject.toml

@@ -160,3 +160,6 @@ test = { features = ["test"], solve-group = "test" }
 
 [tool.pixi.tasks]
 test = { cmd = ["pytest", "$PIXI_PROJECT_ROOT/numba_cuda/numba/cuda/tests"] }
+
+[tool.pyrefly]
+search-path = ["./numba_cuda"]