#235 Fix workflow for testing

Author: astropenguin

.github/workflows/tests.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     container: ghcr.io/astral-sh/uv:${{ matrix.env }}
     env:
-      PYTHON_DIRS: docs tests xarray-dataclasses
+      PYTHON_DIRS: docs tests xarray_dataclasses
       UV_PROJECT_ENVIRONMENT: /usr/local
     strategy:
       fail-fast: false