Add support for GHC version 9.14.1.

[jonathanknowles]

This PR:

• bumps the upper dependency bound for base to < 4.23.
• adds GHC version 9.14.1 to the tested-with list.
• adds GHC version 9.14 to the CI build matrix.

[jonathanknowles]

Hi @emilypi. Hope it's okay for me to create this PR.

I marked it as a "work in progress", as there are still a couple of upstream dependencies that have yet to add support for GHC 9.14.1.

I can currently get it to build with:

cabal build all                           \
    --enable-documentation                \
    --enable-tests                        \
    --allow-newer=splitmix:base           \
    --allow-newer=tagged:template-haskell

Hope this is helpful. Please let me know if you’d like me to change anything!

[jonathanknowles]

Update: it looks as though all upstream dependencies have now added support for GHC 9.14. 🎉

I'll mark this PR as "ready for review".