ci: remove lastModified thing

Author: blaggacao

.github/workflows/update-subflake.sh

@@ -2,11 +2,6 @@
 nix store add-path --name source .
 
 # update the subflake lockfile to the (now existing) store path
-# set lastModified to 1 because unknown issues in the GH action environment
-(cd ./src/local && nix flake lock --update-input std && (
-  jq '.nodes.std.locked.lastModified = 1' flake.lock > flake.lock.new && rm flake.lock && mv flake.lock.new flake.lock
-) && git add -f flake.lock)
-(cd ./src/tests && nix flake lock --update-input std && (
-  jq '.nodes.std.locked.lastModified = 1' flake.lock > flake.lock.new && rm flake.lock && mv flake.lock.new flake.lock
-) &&git add -f flake.lock)
+(cd ./src/local && nix flake lock --update-input std && git add -f flake.lock)
+(cd ./src/tests && nix flake lock --update-input std && git add -f flake.lock)
 # continue normally ...