Make sure to use nightly toolchains that support 2024 Edition

Author: quietlychris

.github/workflows/rust.yml

@@ -23,8 +23,8 @@ jobs:
       fail-fast: false
       matrix:
         toolchain:
-          - 1.81.0
-          - stable
+          - 1.85.0-nightly
+          - nightly
 
     steps:
       - name: Checkout