Adopt cabal-doctest

[ulidtko]

Following hand-over of cabal-doctest from @andreasabel, adding myself onto maintainers list, to receive bounds-breakage notifications.

Resolves ulidtko/cabal-doctest#84

Checklist:

• Meaningful commit message, eg add my-cool-package (please don't mention build-constraints.yml)
• At least 30 minutes have passed since uploading to Hackage
• If applicable, required system libraries are added to 02-apt-get-install.sh or 03-custom-install.sh
• (recommended) Package have been verified to work with the latest nightly snapshot, e.g by running the verify-package script
• (optional) Package is compatible with the latest version of all dependencies (Run cabal update && cabal outdated)

  Outdated dependencies:
  Cabal >=1.10 && <3.14 (latest: 3.14.0.0)
  

[mihaimaruseac]

Approving, but letting the current curator on duty to merge