Change from ffi to ffi-napi since the former seems unsupported

This should also fix installation problem of node-gyp in CI

.github/workflows/build-majestic.yml

@@ -61,7 +61,6 @@ jobs:
       working-directory: ./src/runtime/javascript
       env:
         LD_LIBRARY_PATH: /usr/local/lib
-        PYTHON: /usr/bin/python2
       run: |
         npm ci
         npm run test