Default to cabal version 2.4 when running cabal init --simple.

[m-renaud]

Overview

cabal init --simple provides a way of initializing a cabal package with sensible defaults instead of requiring one to go through the entire interactive prompt. Its goal is to generate a modern directory structure (src/MyLib.hs, app/Main.hs, tests/MyLibTests.hs, etc.) and showcase new cabal features (^>=, recent cabal spec version, common stanzas, etc).

This change defaults to using a more recent cabal spec version instead of the current default of version 1.12.

This partially addresses #5696 and #5705.

Testing

Manually tested. After running cabal init --simple the .cabal file contains cabal-version: 2.4 as the first line of the file.

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[23Skidoo]

Merged, thanks!