Update NIXPKGS_REV to release-2105 (!97) · Merge requests · Administrator / PaymentServer · GitLab

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Administrator requested to merge make-ci-use-release-nixpkgs into main Aug 03, 2021

Created by: hacklschorsch

... so I hopefully don't have to watch CircleCI build GHC another time.

Maybe this just works and speeds up CI build times a googol.