Don't upload PDB files in CI

Somehow it is blocking.

script/upload.py

@@ -90,10 +90,6 @@ def main():
     upload_atom_shell(github, release, os.path.join(DIST_DIR, MKSNAPSHOT_NAME))
 
   if PLATFORM == 'win32' and not tag_exists:
-    # Upload PDBs to Windows symbol server.
-    execute([sys.executable,
-             os.path.join(SOURCE_ROOT, 'script', 'upload-windows-pdb.py')])
-
     # Upload node headers.
     execute([sys.executable,
              os.path.join(SOURCE_ROOT, 'script', 'upload-node-headers.py'),