Update nix flake and support base64-1.0#41

TristanCacqueray merged 5 commits intosoftwarefactory-project:mastersoftwarefactory-project/matrix-client-haskell:masterfrom

TristanCacqueray:nix-bumpTristanCacqueray/matrix-client-haskell:nix-bumpCopy head branch name to clipboard