input splitter depreciation

I had a constant warning using python within spyder4 console:

> DeprecationWarning: `input_splitter` is deprecated since IPython 7.0, prefer `input_transformer_manager`.

and ended up manually replacing l.454 of ipkernel.py
`status, indent_spaces = self.shell.input_splitter.check_complete(code)`
with
`status, indent_spaces = self.shell.input_transformer_manager.check_complete(code)`
to solve my problem.

Inspect ipkernel.py around line 454 and confirm how the kernel checks whether input is complete. Replace the deprecated input_splitter usage with input_transformer_manager as described, then verify that the deprecation warning is gone and input handling still behaves correctly.

Rédigé par le modèle d'indexation à partir du texte de l'issue.