fix(ci): pin wasm-tools to 1.240.0

This commit reverts wasm-tools used in tests to 1.240.0 to avoid
pulling in changes to the async typing that will cause `wasm-tools
compose` to not validate in tests.

Author: vados-cosmonic

.github/workflows/main.yml

@@ -102,7 +102,7 @@ jobs:
 
       - uses: taiki-e/cache-cargo-install-action@7447f04c51f2ba27ca35e7f1e28fab848c5b3ba7 # v2.3.1
         with:
-          tool: wasm-tools
+          tool: wasm-tools@1.240.0
 
       # Determine weval version
       - name: Determine weval version