Drop GHC 8.2/base-4.10 in next major release

[meooow25]

GHC 8.2.2 was released on 2017-07-22, which will be 10 years ago next year (see https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/libraries/version-history)

When dropping it, remove

• All references to mappend. Semigroup is a superclass of Monoid since base-4.11
• This little thing in the CI

  containers/.github/workflows/main.yml

  Lines 64 to 67 in 14a6ce3

  	if: ${{ matrix.ghc == '8.2.2' }}
  	run: |
  	sudo apt-get update
  	sudo apt-get install -y libtinfo5 # See https://github.com/haskell/ghcup-hs/issues/947