[3.13] gh-121266: Remove Py_ALWAYS_INLINE in dictobject.c (GH-121493) (#122095)

gh-121266: Remove Py_ALWAYS_INLINE in dictobject.c (GH-121493)

compare_unicode_generic(), compare_unicode_unicode() and
compare_generic() are callbacks used by do_lookup(). When enabling
assertions, it's not possible to inline these functions.
(cherry picked from commit c5a6b9afd82cad3f6abd9dc71cd5fdd5781a53f5)

Co-authored-by: Victor Stinner <vstinner@python.org>