Fix Windows PyInstaller packaging dependency

Run PyInstaller outside the local packaging package and install a compatible packaging release in CI.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: baremetalgo

.github/workflows/release.yml

@@ -49,6 +49,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install -r requirements.txt
+          python -m pip install "packaging>=23,<25"
           python -m pip install pyinstaller
           python -m pip install Pillow
 

packaging/packager.py

@@ -148,7 +148,10 @@ def build(*, clean: bool, runtime_dir: Path | None = None, gpu: bool = False) ->
         ),
         str(PACKAGING_ROOT / "runtime_launcher.py"),
     ]
-    subprocess.run(command, cwd=ROOT, check=True)
+    # Run PyInstaller outside the repository root.  The application has a
+    # local ``packaging`` package, which would otherwise shadow the
+    # third-party ``packaging`` dependency imported by PyInstaller.
+    subprocess.run(command, cwd=work_dir, check=True)
 
     bundle = _require_path(dist_dir / APP_NAME, directory=True)
     if runtime_dir is None: