ci(audit-signatures): stop verifying in the matrix due to lack of corepack support in old versions

Author: travi

.github/workflows/node-ci.yml

@@ -30,7 +30,6 @@ jobs:
           cache: npm
           node-version: ${{ matrix.node }}
       - run: npm clean-install
-      - run: corepack npm audit signatures
       - run: npm test
   verify:
     runs-on: ubuntu-latest