Update download-package-v1.md

[kaito-ms]

If "packageType = upack", then latest is not available. You must use "*" instead. If you use “latest”, the following error will be logged in the pipeline log

##[error]An unexpected error occurred while trying to download the package. Exit code(20) and error({"@t":"2024-08-15T01:06:54.9437476Z","@m":"The package version provided is invalid. Universal package versions must be lowercase SemVer 2.0 versions without build metadata. The package version must be under 128 characters, and major/minor/patch must each be less than or equal to 2147483647.","@i":"67cc01dd","@l":"Error","SourceContext":"ArtifactTool.Program","UtcTimestamp":"2024-08-15 01:06:54.943Z"})

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