Update Rust version to 1.81.0

Author: flyingsilverfin

WORKSPACE

@@ -119,8 +119,8 @@ rust_register_toolchains(
         "x86_64-pc-windows-msvc",
         "x86_64-unknown-linux-gnu",
     ],
-    rust_analyzer_version = "1.80.1",
-    versions = ["1.80.1"],
+    rust_analyzer_version = "1.81.0",
+    versions = ["1.81.0"],
 )
 
 rust_analyzer_toolchain_tools_repository(