Update SoftFever.OrcaSlicer.installer.yaml

[thebodzio]

x86_64 installer SHOULD use x86_64 binaries

📖 Description

✅ Checklist

• Signed the Contributor License Agreement
• Linked to an issue (if applicable)
  • Resolves #[Issue Number]

📦 Manifest Checklist

• Checked that there aren't other open pull requests for the same manifest update/change
• This PR only modifies one (1) manifest
• Validated manifest locally with winget validate --manifest <path> (validation guide)
• Tested manifest locally with winget install --manifest <path>
• Manifest conforms to the 1.12 schema

Note: <path> is the directory containing the manifest you're submitting.