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Native asset tests use `flutter create --no-pub --template=package_ffi`. The template used for this is checked in. It then adds extra dependencies to checked-in packages in flutter/flutter (which have pinned deps) in those generated templates. It then pins all dependencies in the modified template project. This can lead to constraint violations when flutter updates pinned dependencies, because the template uses old constraints (which are turned from `^x` to `=x`) and the additional dependency on flutter/flutter checked in package brings in different pinned dependencies. In a previous PR we already made this more robust by using flutter's pinned versions over the the versions from the template (that are changed from `^x` to `=x`). Though a new upgrade of flutters pinned packages reveals that this isn't quite sufficient: The template uses `test` at `^X`. The additional dependency to `link_hook` doesn't depend on `test`. It therefore turns it into `=X`. BUT `link_hooks` has a non-dev dependency on `test_core` which is incompatible with `=X`. => So we relax this even more by prefering to choose (pinned) versions of the flutter/flutter `link_hook` dependencies and (new) dev dependencies over the template dependencies. => This will make use use the pinned `test` version from `link_hooks` instead of from the template.
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