Use Path() instead of str for path comparison

On Windows specifically is common to have drives diverging just by
casing ("C:" vs "c:"), depending on the cwd provided by the user.

src/_pytest/nodes.py

@@ -30,6 +30,7 @@
 from _pytest.outcomes import fail
 from _pytest.outcomes import Failed
 from _pytest.store import Store
+from _pytest.pathlib import Path
 
 if TYPE_CHECKING:
     # Imported here due to circular import.
@@ -360,7 +361,7 @@ def _repr_failure_py(
             truncate_locals = True
 
         try:
-            abspath = os.getcwd() != str(self.config.invocation_dir)
+            abspath = Path(os.getcwd()) != Path(self.config.invocation_dir)
         except OSError:
             abspath = True