Bump torch-mlir to d6cf718 (#18530)

https://github.com/llvm/torch-mlir/commit/d6cf718f103a50e57d39ffb85a878bc8ba1ca16a
Includes safe soft max lowering that should get sdxl working with latest
torch
(https://github.com/llvm/torch-mlir/commit/d61986cfcf301234c61b55403cb818d1c1874fa7)

Signed-off-by: saienduri <saimanas.enduri@amd.com>
diff --git a/third_party/torch-mlir b/third_party/torch-mlir
index edf725e..d6cf718 160000
--- a/third_party/torch-mlir
+++ b/third_party/torch-mlir
@@ -1 +1 @@
-Subproject commit edf725ef42b9bc7bc1dada691a3988b3c0038e33
+Subproject commit d6cf718f103a50e57d39ffb85a878bc8ba1ca16a