fixup! Drop Yosys submodule, use Yosys line-up for testing

.github/workflows/build-and-test.yaml

@@ -33,7 +33,7 @@ jobs:
         run: |
           git clone --depth 1 \
             --branch ${{ matrix.yosys_version }} \
-            -- https://github.com/YosysHQ/yosys.git tests/third_party/
+            -- https://github.com/YosysHQ/yosys.git tests/third_party/yosys
       - if: ${{ steps.cache-yosys.outputs.cache-hit != 'true' }}
         name: Build Yosys
         shell: bash