gnu: python-argcomplete: Update to 1.10.3.

Co-authored-by: pimi <madalinionel.patrascu@mdc-berlin.de>

* gnu/packages/python-xyz.scm (python-argcomplete): Update to 1.10.3.
[arguments]: Patch completion script to keep tool references.
[inputs]: Add "grep" and "which".
[native-inputs]: Add "python-coverage", "python-flake8", "python-wheel", and
"fish".