Remove support for ghc-8.8.2

[jneira]

• Hi, those ghc versions were released quite time ago and bot have 2 new minor versions available and widely used
  • 8.8.2 was released on 2020-01-16
  • 8.10.2 was released on 2020-08-08 and it has not gotten to have stackage lts

[jneira]

I would like to know some statistics about ghc downloads per version, to have some numbers on which make the decision, anyone knows where thay could be found?

[konn]

I'm strongly against removing 8.10.2 support, as there is known thread-safety issue #1465 for 8.10.-8.10.4, and its fixes in 8.10.5 is not yet released...

[jneira]

I'm strongly against removing 8.10.2 support, as there is known thread-safety issue #1465 for 8.10.3-8.10.4, and its fixes in 8.10.5 is not yet released...

Thanks for noting it, this is a good reason to keep it around