Update _util.py to fix Deprecation Warning (#13844)

Fixes issue 13843 involving a Deprecation Warning with the python package Click.

Author: weezymatt

spacy/cli/_util.py

@@ -20,7 +20,7 @@
 import srsly
 import typer
 from click import NoSuchOption
-from click.parser import split_arg_string
+from click.shell_completion import split_arg_string
 from thinc.api import Config, ConfigValidationError, require_gpu
 from thinc.util import gpu_is_available
 from typer.main import get_command