Pin foundry version in CI (#486)

Author: bkolad

.github/workflows/rust.yml

@@ -86,6 +86,8 @@ jobs:
       - uses: Swatinem/rust-cache@v2
       - uses: mozilla-actions/[email protected]
       - uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: v1.0.0
       - name: Run cargo test
         run: cargo test
   coverage: