Bump flake versions

Fixes #1548 Flake lock file updates: • Updated input 'nixpkgs': 'github:NixOS/nixpkgs/0ea7a8f1b939d74e5df8af9a8f7342097cdf69eb' (2022-07-02) → 'github:NixOS/nixpkgs/677ed08a50931e38382dbef01cba08a8f7eac8f6' (2022-12-29) • Updated input 'utils': 'github:numtide/flake-utils/c91f3de5adaf1de973b797ef7485e441a65b8935' (2021-10-21) → 'github:numtide/flake-utils/5aed5285a952e0b949eb3ba02c12fa4fcfef535f' (2022-11-02)

Author: scottbot95