0019aa11

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Update the flake inputs

Drops the nixos-25.05 backward-compatibility check with them: sydtest no
longer builds on the GHC that release ships, and 26.05 is the release this
has to work on.  nixos-25.11 still works, so it stays.
forwardCompatibilitynixpkgs-25_11pre-commitreleaseconfiguredevShellautodocodecautodocodec-api-usageautodocodec-exactautodocodec-http-api-dataautodocodec-nixautodocodec-openapi3autodocodec-schemaautodocodec-servant-multipartautodocodec-swagger2autodocodec-yamlrelease-to-hackagex86_64-linux