changed elan install

Author: jtristan

.github/workflows/build_java.yml

@@ -15,6 +15,8 @@ jobs:
           curl -sSfL https://github.com/leanprover/elan/releases/download/v1.4.2/elan-x86_64-unknown-linux-gnu.tar.gz | tar xz
           ./elan-init -y --default-toolchain none
           echo "$HOME/.elan/bin" >> $GITHUB_PATH
+      - name: run elan
+        run: elan default stable
       - uses: actions/checkout@v4
       - run: bash scripts/prep.sh
       - run: DAFNY=dafny/dafny TARGET_LANG=java bash scripts/build.sh