Lift beta to 1.86

Author: nbdd0121

README.md

@@ -22,7 +22,7 @@ Note that klint currently is pinned to a Rust version so it is likely that runni
 
 To run this tool, use rustup which will prepare the necessary environment variables:
 ```
-rustup run beta klint
+rustup run 1.86 klint
 ```
 
 `klint` will behave like rustc, just with additional lints.

rust-toolchain

@@ -3,5 +3,5 @@
 # SPDX-License-Identifier: MIT OR Apache-2.0
 
 [toolchain]
-channel = "beta"
+channel = "1.86"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src"]