Pin sphinx-argparse version (vllm-project#6453)

Signed-off-by: kevin <[email protected]>
Signed-off-by: LeiWang1999 <[email protected]>

Author: khluu

docs/requirements-docs.txt

@@ -2,7 +2,7 @@ sphinx==6.2.1
 sphinx-book-theme==1.0.1
 sphinx-copybutton==0.5.2
 myst-parser==2.0.0
-sphinx-argparse
+sphinx-argparse==0.4.0
 
 # packages to install to build the documentation
 pydantic