gh-150244: Fix test_create_subprocess_env_shell to handle cpython path

containing spaces

On non-win32 systems, the path to the executable was not quoted,
causing issues when building the command if it contains spaces, causing
the test to fail.

Author: edvilme

Lib/test/test_asyncio/test_subprocess.py

@@ -1,4 +1,5 @@
 import os
+import shlex
 import signal
 import sys
 import textwrap
@@ -770,9 +771,7 @@ async def check_stdout_output(self, coro, output):
 
     def test_create_subprocess_env_shell(self) -> None:
         async def main() -> None:
-            executable = sys.executable
-            if sys.platform == "win32":
-                executable = f'"{executable}"'
+            executable = f'"{sys.executable}"' if sys.platform == "win32" else shlex.quote(sys.executable)
             cmd = f'''{executable} -c "import os, sys; sys.stdout.write(os.getenv('FOO'))"'''
             env = os.environ.copy()
             env["FOO"] = "bar"