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IsList instance for ZipList should debut in base-4.14.0.0, not 4.15.0.0

Commits 1f911de4, e3672f40, and 3957bdf2 (sorry for not ensuring that those were squashed!) added an IsList instance for ZipList and targeted its release to be base-4.15.0.0. After some discussion with @bgamari in !2137 (closed), we agreed that this really ought to be base-4.14.0.0 instead. To that end, the following must be done:

  1. A commit that changes libraries/base/changelog.md accordingly in master.
  2. Backport 1f911de4, e3672f40, and 3957bdf2, and the commit from part (1) to the ghc-8.10 branch.
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