Update main.yml

Author: lorisleiva

.github/workflows/main.yml

@@ -75,7 +75,7 @@ jobs:
       - name: Install Solana
         uses: solana-program/actions/install-solana@v1
         with:
-          base_url: https://release.anza.xyz
+          base_url: 'https://release.anza.xyz'
           version: ${{ matrix.solana }}
       - name: Install Rustfmt
         uses: dtolnay/rust-toolchain@master