Cabal & cabal-install 3.12.1.0 release list

[Mikolaj]

The machine never stops.

3.12.1.0 is a new major release pushing out (almost) all that's on master currently.

See: cabal 3.12 board

Backports waiting to be applied (to this and/or other release branches): https://github.com/haskell/cabal/pulls?q=is%3Aopen+is%3Apr+label%3Abackport

Here are the bullet points for releasing 3.12.1.0 for Cabal & cabal-install. (This is stub for now. Please fill in.)

Tasks

• Changelogs

Cabal

• Version bump (see Update Cabal{,-install,-syntax} to 3.10.2.0 #9033 for an old release example)
• TODO: more

Cabal-syntax

• Version bump (see Update Cabal{,-install,-syntax} to 3.10.2.0 #9033 for an old release example)
• Update of SPDX license Ids & exceptions (see Update SPDX license Ids & exceptions to 3.20 #9028 for an old release example)

cabal-install

• Version bump (see Update Cabal{,-install,-syntax} to 3.10.2.0 #9033 for an old release example)
• TODO: more

cabal-install-solver

• Version bump (see Update Cabal{,-install,-syntax} to 3.10.2.0 #9033 for an old release example)
• TODO: more

Here is the previous ticket from this series: #9008