okay it's not a straight upgrade because if you use nix flake update --commit-lock-file the url you get back is so fucking long

compare:

• Updated input 'home-manager':
    'github:nix-community/home-manager/f772b7f968365e7b2b70a860c509d214639556fe' (2026-08-31)
  → 'github:nix-community/home-manager/693e8ce0fb240a73c116a03cfd7b19269c87af88' (2026-09-04)

with:

• Updated input 'nixpkgs':
    'https://releases.nixos.org/nixos/unstable/nixos-26.11pre1064949.34ab99075ac4/nixexprs.tar.zst?lastModified=1788179007&narHash=sha256-maQBa7XmWJ%2Ba6te4QwF%2B%2BR1FIXUrjvki0AtGOOhyZn0%3D&rev=34ab99075ac4f7e40cf037eef32cb1c360bb85e9
026-08-31)
  → 'https://releases.nixos.org/nixos/unstable/nixos-26.11pre1066703.0968519e14f7/nixexprs.tar.zst?lastModified=1788404924&narHash=sha256-gxryTzdoDQLrvPdYp8cSbxXpB/LDhaQhiJFCmkqVugw%3D&rev=0968519e14f7aa7d3e9b389682bd74d2b51c8ce8' (202

(yes it's cut off, it was too long to fit on a full screen terminal. the point stands.)