`SortBonds` function bothered me since the last time I refactored this part.
We always know that it only accepts `network.LinkSpec`s, but we accepted the slice of untyped Resources because
this is what `List` method returns. Now we can do better, since `safe.List` now supports `Swap` method.
We can utilize `sort.Interface` and pass `safe.List` directly to `SortBonds`.
Signed-off-by: Dmitriy Matrenichev <dmitry.matrenichev@siderolabs.com>
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