fix: try point setup-rust-toolchain at Cargo.toml

Author: auxesis

.github/workflows/test-eql.yml

@@ -47,6 +47,7 @@ jobs:
           components: rustfmt
           cache: true
           cache-all-crates: true
+          rust-src-dir: tests/sqlx/
 
       - uses: jdx/mise-action@v2
         with: