Fix typo (#1631)

hamishmack · web-flow · commit e1b76b23b841 · 2022-08-31T15:59:35.000+12:00
diff --git a/scripts/update-external.nix b/scripts/update-external.nix
@@ -35,7 +35,7 @@ in
 
     cd ..
 
-    nix flack lock --accept-flake-config \
+    nix flake lock --accept-flake-config \
                    --experimental-features 'nix-command flakes' \
                    --update-input ${name}
   ''
