Changes

debian-bookworm-build: update sphinx-argparse branch

Our changes are now in the "inside-classes" branch.

Fix for:
  Collecting sphinx-argparse
    Cloning https://github.com/osmocom/sphinx-argparse (to revision master) to /tmp/pip-install-cff9hqce/sphinx-argparse_4b90c55018034988836549dbf04f94ad
    Running command git clone --filter=blob:none --quiet https://github.com/osmocom/sphinx-argparse /tmp/pip-install-cff9hqce/sphinx-argparse_4b90c55018034988836549dbf04f94ad
    WARNING: Did not find branch or tag 'master', assuming revision or ref.
    Running command git checkout -q master
    error: pathspec 'master' did not match any file(s) known to git

Change-Id: I666972097db269dd1e46031854719210e993a71a