Sync up purescript and purescript-test-runner packages.dhall

[FranklinChen]

This should be merged at the same time as the corresponding purescript-test-runner psc-0.15.15-20250421 branch merge.

[github-actions]

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[github-actions]

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[github-actions]

This is an unmaintained repository.

Cross-track maintainers - feel free to merge.

[SleeplessByte]

Merging now with exercism/purescript-test-runner#57