Rollup merge of #40778 - alexcrichton:update-cargo, r=alexcrichton

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