[3.12] gh-104432: Use `memcpy()` to avoid misaligned loads (GH-104433) (#107355)

gh-104432: Use `memcpy()` to avoid misaligned loads (GH-104433)

Fix potential unaligned memory access on C APIs involving returned sequences
of `char *` pointers within the :mod:`grp` and :mod:`socket` modules. These
were revealed using a ``-fsaniziter=alignment`` build on ARM macOS.
(cherry picked from commit f01e4cedba1a17d321664834bb255d9d04ad16ce)

Co-authored-by: Christopher Chavez <chrischavez@gmx.us>