update workflow

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
         run: |
           set -o pipefail
           curl -sSfL https://github.com/leanprover/elan/releases/download/v3.0.0/elan-x86_64-unknown-linux-gnu.tar.gz | tar xz
-          ./elan-init -y --default-toolchain none
+          ./elan-init -y
           echo "$HOME/.elan/bin" >> $GITHUB_PATH
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v3