Fix windows arm64 CI

Author: alexcrichton

.github/workflows/main.yml

@@ -95,7 +95,7 @@ jobs:
       with:
         submodules: true
     - name: Install Rust
-      run: rustup update stable && rustup default stable
+      run: rustup update stable --no-self-update && rustup default stable
     - run: rustup target add aarch64-pc-windows-msvc
     - run: cargo test --no-run --target aarch64-pc-windows-msvc
     - run: cargo test --no-run --target aarch64-pc-windows-msvc --features verify-winapi