Try lower version of cross

.github/workflows/ci.yml

@@ -75,6 +75,6 @@ jobs:
       - name: Check No Standard Library Support
         run: |
           rustup target add --toolchain ${{ matrix.toolchain }} thumbv7m-none-eabi
-          cargo install cross --locked
+          cargo install cross@0.2.1 --locked
           cross build --package bip324 --target thumbv7m-none-eabi --no-default-features --features alloc