update miri

diff --git a/src/tools/miri b/src/tools/miri
index 39a524f694e42cfb178639d490d3fdbbaf8569dc..b12ebfc3de853abf6b4260c44a71cd51323803c5 160000 (submodule)
--- a/src/tools/miri
+++ b/src/tools/miri
@@ -1 +1 @@
-Subproject commit 39a524f694e42cfb178639d490d3fdbbaf8569dc
+Subproject commit b12ebfc3de853abf6b4260c44a71cd51323803c5