Maybe this fixes CI?

Author: jneem

.github/workflows/ci.yaml

@@ -63,6 +63,7 @@ jobs:
         run: |
           rustup update --no-self-update ${{ env.RUST_CHANNEL }}
           rustup component add rustfmt rust-src
+          rustup default ${{ env.RUST_CHANNEL }}
 
       - name: Cache Dependencies
         uses: Swatinem/rust-cache@988c164c3d0e93c4dbab36aaf5bbeb77425b2894