Update cargo

diff --git a/src/tools/cargo b/src/tools/cargo
index 3ebb5f15a940810f250b68821149387af583a79e..66a6737a0c9f3a974af2dd032a65d3e409c77aac 160000 (submodule)
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 3ebb5f15a940810f250b68821149387af583a79e
+Subproject commit 66a6737a0c9f3a974af2dd032a65d3e409c77aac