simplify inputs

[jenseng]

potentially a simpler way of doing things, no more with json shenanigans:

- uses: jenseng/dynamic-uses@v2
  with:
    # the `uses` input supports expressions 🥳, and determines which dynamic action will run
    uses: actions/setup-node@${{ inputs.version }}
    # any other inputs will be passed along to the dynamic action
    node-version: 18

... though the downside is now we get warnings about Unexpected input(s) for both dynamic-uses and the resolved action, which is not ideal ... might abandon this if i can't find a workaround

[jenseng]

closing in favor of #25