Pin jsonargparse maximum version

Author: carmocca

requirements/extra.txt

@@ -5,6 +5,6 @@ horovod>=0.21.2  # no need to install with [pytorch] as pytorch is already insta
 torchtext>=0.8.*
 omegaconf>=2.0.5
 hydra-core>=1.0.5
-jsonargparse[signatures]>=4.0.4
+jsonargparse[signatures]>=4.0.4,<5.0.0
 gcsfs>=2021.5.0
 rich>=10.2.2