workflows/main.yml seems using incorrect matrix variable

Hi, I noticed that in `main.yml`, the steps seem to be using undefined matrix variables: `matrix.webpack-version` and `matrix.node-version`.

hope this is helpful.

Start with .github/workflows/main.yml and inspect the matrix definition alongside the steps that reference matrix.webpack-version and matrix.node-version. Confirm the variable names match, then validate the workflow configuration and ensure the affected workflow runs with the intended webpack and Node versions.

Written by the indexing model from the issue text.