[GHC] Batch modify: #13723, #13896, #13898, #13905, #13906, #13981, ...

[GHC]

Batch modification to #13723, #13896, #13898, #13905, #13906, #13981, #14003, #14030, #14040, #14155, #14165, #14190, #14214, #14242, #14252, #14261, #14268, #14283, #14298 by bgamari:
milestone to 8.8.1

Comment:
These won't be addressed by GHC 8.6.

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