[geopandas] Add apt_dependencies

Author: srittau

stubs/geopandas/METADATA.toml

@@ -2,3 +2,8 @@ version = "1.0.1"
 # Requires a version of numpy with a `py.typed` file
 requires = ["numpy>=1.20", "pandas-stubs", "types-shapely", "pyproj"]
 upstream_repository = "https://github.com/geopandas/geopandas"
+
+[tool.stubtest]
+# libproj-dev is required for pyproj if wheels for the target Python version
+# are not available.
+apt_dependencies = ["libproj-dev"]