Incorrect redirect when `download_site_uri` is present

[Poundex]

It seems when packages have the download_site_uri set (which doesn't seem to be common) then hitting the /redirect for that particular package will redirect to download_site_uri instead of direct_download_uri, even when direct_download_uri is present and correct.

GET https://api.foojay.io/disco/v3.0/ids/9d7cb147358cf7ea8e0ff46dfbc38c36

HTTP/2 200 OK

{
  "result": [
    {
      "filename": "graalvm-community-jdk-25i1-25.0.3_linux-x64_bin.tar.gz",
      "direct_download_uri": "https://github.com/graalvm/graalvm-ce-builds/releases/download/graal-25.1.3/graalvm-community-jdk-25i1-25.0.3_linux-x64_bin.tar.gz",
      "download_site_uri": "https://github.com/graalvm/graalvm-ce-builds/releases",
      "signature_uri": "",
      "checksum_uri": "https://github.com/graalvm/graalvm-ce-builds/releases/download/graal-25.1.3/graalvm-community-jdk-25i1-25.0.3_linux-x64_bin.tar.gz.sha256",
      "checksum": "e9cd1637be853e105f8b09125b4b19fbce385696465d782cbca8bb80e1df8f0d",
      "checksum_type": "sha256"
    }
  ],
  "message": ""
}

but

GET https://api.foojay.io/disco/v3.0/ids/9d7cb147358cf7ea8e0ff46dfbc38c36/redirect

HTTP/2 301 Moved Permanently

location: https://github.com/graalvm/graalvm-ce-builds/releases

And so the resulting download ends up with the HTML content of the GitHub releases page, which naturally doesn't work

 Some toolchain resolvers had provisioning failures: foojay (Unable to download toolchain matching the requirements ({languageVersion=25, vendor=GraalVM Community, implementation=vendor-specific, nativeImageCapable=false}) from 'https://api.foojay.io/disco/v3.0/ids/9d7cb147358cf7ea8e0ff46dfbc38c36/redirect', due to: Cannot expand TAR '~/.gradle/jdks/releases-GraalVM-Community-25'.).