Use nightly rust for windows CI

Required to fix rust-lang/rust#129020

Author: TobiasFella

.github/workflows/ci.yml

@@ -138,6 +138,7 @@ jobs:
         .\rustup-init.exe -y --default-host=x86_64-pc-windows-msvc --default-toolchain=none
         del rustup-init.exe
         rustup target add x86_64-pc-windows-msvc
+        rustup override add nightly
       shell: powershell
 
     - name: Install Rustup