Move to pdm as build env

tests/integration/test_converter.py

@@ -1,17 +1,19 @@
 import ergogen_footprint_converter.main as main
 
 def test_simple(tmp_path):
-    out = tmp_path / "out/promicro.js"
-    out.parent.mkdir()
+    out_dir = tmp_path / "out"
+    out_dir.mkdir()
 
     args = {
         "in":  "./data/simple/promicro.kicad_mod",
-        "out": out
+        "out": out_dir
     }
 
     main.main(args)
 
     expected = open("tests/integration/data/simple/promicro.js").readlines()
 
-    assert out.read_file() == expected
+    
+    out = out_dir / "promicro.js"
+    assert out.read_text() == expected