Remove final solc invocation from solc_download.sh

[diegs]

$GITHUB_PATH is updated, but that doesn't take effect in the same script that updates it.

https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#adding-a-system-path

This probably works for people who already have e.g. $HOME/.local/bin on their $PATH, but that's not generally true.

[emretepedev]

It's exactly what I needed, thanks!

      - name: Setup Solc
        if: steps.changed-sol-files.outputs.any_changed == 'true'
        uses: pontem-network/get-solc@f67593db4487ac96b4bf8031123a6deefc399b2e
        with:
          version: v${{ env.SOLC_VERSION }}