fix: upgrades needs to be an array

[Kikketer]

Reported in the arcade-sprite-data plugin microsoft/arcade-sprite-data#6.

The upgrade is a string but should be an array. This prevents the warning:

invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> m
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> i
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> n
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> :
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> v
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> 0
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> .
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> 0
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> .
invalid upgrade rule: github:microsoft/arcade-sprite-data#v0.2.1 -> 6

[Copilot]

Pull Request Overview

This PR fixes a data type issue in the targetconfig.json file where the upgrades field was incorrectly specified as a string instead of an array. This was causing the system to iterate over each character of the string, generating invalid upgrade rule warnings for each character.

Key Changes:

• Corrected the upgrades field format from a string to an array for the microsoft/arcade-sprite-data package configuration

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