Update to rustc 1.85

Author: Paolo Tranquilli

MODULE.bazel

@@ -4,3 +4,11 @@ module(
 )
 
 bazel_dep(name = "rules_rust", version = "0.57.1")
+
+rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
+rust.toolchain(
+    versions = ["1.85.0"],
+)
+use_repo(rust, "rust_toolchains")
+
+register_toolchains("@rust_toolchains//:all")