otools-submodule update broken when reference is not found

[simahawk]

otools-submodule update should fetch remote aggregation branches to ensure the checkout does not fail.

A typical error

Auto-share conf found for /home/sorsi/.cache/git-autoshare/github.com/l10n-switzerland
Traceback (most recent call last):
  File "/home/sorsi/.pyenv/versions/cos18/bin/otools-submodule", line 8, in <module>
    sys.exit(cli())
             ^^^^^
  File "/home/sorsi/.pyenv/versions/cos18/lib/python3.12/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sorsi/.pyenv/versions/cos18/lib/python3.12/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/home/sorsi/.pyenv/versions/cos18/lib/python3.12/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sorsi/.pyenv/versions/cos18/lib/python3.12/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sorsi/.pyenv/versions/cos18/lib/python3.12/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sorsi/dev/c2c_tools/odoo-project-tools/odoo_tools/cli/submodule.py", line 87, in update
    git.submodule_update(submodule.path)
  File "/home/sorsi/dev/c2c_tools/odoo-project-tools/odoo_tools/utils/git.py", line 136, in submodule_update
    run(cmd + args, check=True)
  File "/home/sorsi/dev/c2c_tools/odoo-project-tools/odoo_tools/utils/os_exec.py", line 41, in run
    res = subprocess.run(cmd, capture_output=True, env=get_venv(), check=check)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sorsi/.pyenv/versions/3.12.0/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['git', 'submodule', 'update', '--init', '--reference', '/home/sorsi/.cache/git-autoshare/github.com/l10n-switzerland', 'odoo/external-src/l10n-switzerland']' returned non-zero exit status 128.

This could be easily get fixed by running this command on the checked out submodule:

git fetch camptocamp 'refs/heads/merge-branch-$proj_id*:refs/remotes/camptocamp/merge-branch-$proj_id*

'