Fix getting Pixi env info on Posix systems

Author: ccordoba12

spyder_kernels/utils/pythonenv.py

@@ -64,15 +64,17 @@ def get_conda_env_path(pyexec, quote=False):
 
 def get_pixi_manifest_path_and_env_name(pyexec, quote=False):
     pyexec_path = Path(pyexec.replace("\\", "/"))
-    pixi_env_path = pyexec_path.parent
+    pixi_env_path = pyexec_path.parents[0 if os.name == "nt" else 1]
     pixi_env_name = pixi_env_path.name
     pixi_dir_path = pixi_env_path.parents[1]
+
     pixi_manifest_path = None
     pixi_manifest_paths = [
         pixi_dir_path.parent / "pixi.toml",
         pixi_dir_path.parent / "pyproject.toml",
         pixi_dir_path.parent / "manifests" / "pixi-global.toml",
     ]
+
     for manifest_path in pixi_manifest_paths:
         if manifest_path.exists():
             pixi_manifest_path = manifest_path