Switch back to nightly build of foundry (#75)

Author: davidlaprade

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Install Foundry
         uses: foundry-rs/foundry-toolchain@v1
         with:
-          version: nightly-e649e62f125244a3ef116be25dfdc81a2afbaf2a
+          version: nightly
 
       - name: Run tests
         run: forge test