backend/tardigrade: Upgrade uplink to v1.0.7

This fixes a regression in the rclone tests from the v1.0.6 upgrade of
uplink. The failure was due to an improperly converted error resulting
in the wrong type of error.
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f