mercurial 3.2.3

Closes #35110.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libgit2 0.21.3

Closes #35110.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libgit2: update 0.21.3 bottle.
mercurial: update 3.2.3 bottle.
fix libmemcached opt_servers nullptr-compare
libmemcached: update 1.0.18 bottle.