flake.lock: Update

Flake lock file updates:

• Updated input 'icon-themes-nightly-overlay':
    'github:zachcoyle/icon-themes-nightly-overlay/7f54e9c7ba111f979ccb91bcda00a703215c93cb?narHash=sha256-tudyzUw2Elzh/pwcTk93R1r4vvmdBEm0cTDLGwCewEc%3D' (2024-09-12)
  → 'github:zachcoyle/icon-themes-nightly-overlay/bc35c5e3b9d5d27e666311091f129510af7a7b13?narHash=sha256-QNW/WKL91lBxR1DxHXBqP1iCdHD6nhnRs0EWlAyNJRc%3D' (2024-09-13)
• Updated input 'neovim-plugins-nightly-overlay':
    'github:zachcoyle/neovim-plugins-nightly-overlay/fb43fcca736e5dc70116934ec3cbdb57200cdab9?narHash=sha256-s22hu2djeCKZyWxppr87JLr/X7K9T%2BmlP/oLFQrCyHg%3D' (2024-09-12)
  → 'github:zachcoyle/neovim-plugins-nightly-overlay/a5e03e2dd2bb7a6c24f7312d88640c955ed182da?narHash=sha256-cLuHpUEPbet2MsMkq1mict%2BwsHEOG4w4M0w7kVQ9QwQ%3D' (2024-09-13)
• Updated input 'nur':
    'github:nix-community/nur/518cc88e1134930487f7e1c52a5645caeec10729?narHash=sha256-de7LRycta8kLe1xoXkwnoto/kFZSPAiazYg84NKFoJM%3D' (2024-09-12)
  → 'github:nix-community/nur/2eae4ae33e23857bd5784b1a5b7200573dbf3b01?narHash=sha256-kz%2B%2BCbXfIcAWqQ0U6N7f%2BIg2GSmsDjXwMqo/4daDx2s%3D' (2024-09-13)