Update pyproject.toml

Author: tsutterley

pyproject.toml

@@ -124,4 +124,8 @@ numpy = "*"
 pyproj = "*"
 scipy = ">=1.10.1"
 shapely = "*"
-xarray = "*"
+
+[tool.pixi.feature.dev.dependencies]
+flake8 = "*"
+pytest = ">=4.6"
+pytest-cov = "*"