fixup! ci: custom update-flake with sign commits

Author: kid

.github/workflows/update-flake-lock.yaml

@@ -35,7 +35,7 @@ jobs:
           set -euo pipefail
           set -x
 
-          mapfile -t CHANGED < <(git diff --name-only | xargs)
+          CHANGED=($(git diff --name-only | xargs))
 
           # TODO: use an array for $FILES
           for value in "${CHANGED[@]}"; do