Update Cargo submodule

Bring in a few last-minute updates before the 1.30.0 release

diff --git a/src/tools/cargo b/src/tools/cargo
index 2fb77a49b43bf7266793c07a19a06749e6a8ad5a..b917e35248fe57d11765c5a835de33e335babb7e 160000 (submodule)
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 2fb77a49b43bf7266793c07a19a06749e6a8ad5a
+Subproject commit b917e35248fe57d11765c5a835de33e335babb7e