Update to the latest Rust nightly.

sunfishcode · sunfishcode · commit b6ff41a9522c · 2023-09-09T12:30:17.000-07:00
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2023-08-25"
+channel = "nightly-2023-09-09"
 components = ["rustc", "cargo", "rust-std", "rust-src", "rustfmt"]
