update cargo submodule

This brings in several fixes and the new handling of __CARGO_DEFAULT_LIB_METADATA

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

diff --git a/src/tools/cargo b/src/tools/cargo
index abf01e1eddb3145c83f71b469ea7bee37141e5e1..d2d6e675fcb70cfb91c2cf2fad8cdd345c120316 160000 (submodule)
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit abf01e1eddb3145c83f71b469ea7bee37141e5e1
+Subproject commit d2d6e675fcb70cfb91c2cf2fad8cdd345c120316