Update libs/toml-rs

Include alexcrichton/toml-rs@66c8348

diff --git a/libs/toml-rs b/libs/toml-rs
index b663d6ae99294a0825f4e1b11c5b3110d56bc65f..66c83483f880c87e44c57617bec2615e945cce14 160000 (submodule)
--- a/libs/toml-rs
+++ b/libs/toml-rs
@@ -1 +1 @@
-Subproject commit b663d6ae99294a0825f4e1b11c5b3110d56bc65f
+Subproject commit 66c83483f880c87e44c57617bec2615e945cce14