fix(serve): quote python executable on POSIX (#4122)

* fix: quote executable when creating watchers

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

* fix: only quote on non-windows platform

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

* Update src/bentoml/serve.py

---------

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>
Co-authored-by: bojiang <5886138+bojiang@users.noreply.github.com>

src/bentoml/serve.py

@@ -5,6 +5,7 @@
 import json
 import logging
 import os
+import shlex
 import shutil
 import sys
 import tempfile
@@ -104,7 +105,7 @@ def create_watcher(
 
     return Watcher(
         name=name,
-        cmd=cmd,
+        cmd=shlex.quote(cmd) if psutil.POSIX else cmd,
         args=args,
         copy_env=True,
         stop_children=True,