Provide a way to download the latest version of Pandoc

[IndrajeetPatil]

I prefer to always use the latest released version of Pandoc, and my current way of doing this is my hard-coding the version number.

      - uses: r-lib/actions/setup-pandoc@v2
        with:
          pandoc-version: "2.19.2"

But this is, of course, suboptimal since I manually need to keep updating the version number.

Instead, I was wondering if it would be possible to use some sentinel value, like the following (which currently doesn't work):

      - uses: r-lib/actions/setup-pandoc@v2
        with:
          pandoc-version: release

This is similar to how one can install the latest pre-release version of Quarto:

      - uses: quarto-dev/quarto-actions/setup@v2
        with:
          version: pre-release

[gaborcsardi]

This is tracked at #469.

[github-actions]

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