Deprecate `memory-0.14.12` on Hackage

[Gabriella439]

I ran into the following issue in one of my Travis CI builds when building memory-0.14.12:

Data/ByteArray/Methods.hs:303:1:
    No instance for (ByteArray (SPE.Block Word8))
      arising from a specialisation pragma for ‘convert’
    In the SPECIALISE pragma
      {-# SPECIALIZE convert :: SPE.ByteString -> SPE.Block Word8 #-}
Data/ByteArray/Methods.hs:305:1:
    No instance for (ByteArrayAccess (SPE.Block Word8))
      arising from a specialisation pragma for ‘convert’
    In the SPECIALISE pragma
      {-# SPECIALIZE convert :: SPE.Block Word8 -> SPE.ByteString #-}

I saw that this is fixed in memory-0.14.13 so this is just a request to deprecate version 0.14.12 on Hackage so that cabal avoids selecting it

[vincenthz]

I'm not going to start marking this on hackage one way or another. I don't see the usefulness, either the latest should be used, or users has selected something older for whatever reason and that's their prerogatives.