fix: correct Foundry version format in workflow

Author: YukiTsuchida

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Install Foundry
       uses: foundry-rs/foundry-toolchain@v1
       with:
-        version: 1.4.1
+        version: v1.4.1
 
     - name: Check out code into the Go module directory
       uses: actions/checkout@v3