PR #39: Release to Hackage from CI, and update the flake inputs

Agent Instructions

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https://staging.nix-ci.com/gh:NorfairKing:ical/refs%2Fpull%2F39%2Fmerge/380a7cb8e38f145d3b30bf0a7c0473b5c33b4eb2

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• curl --netrc -H 'Accept: text/markdown' https://staging.nix-ci.com/gh:NorfairKing:ical/refs%2Fpull%2F39%2Fmerge

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