tests: fix sortdict doctest with Python 3.12
The output of OrderedDict changed to use plain dict syntax:
$ python3.11 -c "import collections;print(collections.OrderedDict([('a', 0), ('b', 1)]))"
OrderedDict([('a', 0), ('b', 1)])
$ python3.12 -c "import collections;print(collections.OrderedDict([('a', 0), ('b', 1)]))"
OrderedDict({'a': 0, 'b': 1})
#if no-windows no-osx
$ mkdir -p xdgconf/hg
$ echo '[ui]' > xdgconf/hg/hgrc
$ echo 'username = foobar' >> xdgconf/hg/hgrc
$ XDG_CONFIG_HOME="`pwd`/xdgconf" ; export XDG_CONFIG_HOME
$ unset HGRCPATH
$ hg config ui.username 2>/dev/null
foobar
#endif