Bump Aleph so Lamina can be unpinned.

The transitive dependency on Lamina was causing problems (fixed in
8f429796efcdadec836838bcf6c1362bd7846dbb) due to Lamina depending on a
vanishing Metrics snapshot. Lamina no longer depends on Metrics
(ztellman/lamina@f632319fb8b327e19a834b0694a6d2168ddbf205), and Aleph
0.3.0-beta16 now depends on that newer version of Lamina
(ztellman/aleph@58c4dd98ca85e428e3dba09fdceae8e76aac517c), so we're
good.