Update cargo submodule

I'm not really sure what we want the cadence here to be. We'll at the very least
update the Cargo submodule right before all releases, but otherwise I figured we
could just do it whenever needed or otherwise weekly (or something like that).

In any case, I don't have a super strong particular reason to do this, it's just
been a week or so since the release!

1 files changed, 0 insertions, 0 deletions

diff --git a/cargo b/cargo
-Subproject c995e9eb5acf3976ae8674a0dc6d9e958053d9f
+Subproject 4e95c6b41eca3388f54dd5f7787366ad2df637b