database: Simplify before update trigger for the crates table

We no longer need to filter out updates to the `downloads` columns since that column is no longer being written to and will be removed in a follow-up commit.

Author: Turbo87

migrations/2024-03-04-144026_change-crates-updated-at-trigger/down.sql

@@ -0,0 +1,8 @@
+drop trigger trigger_crates_set_updated_at
+    on crates;
+
+create trigger trigger_crates_set_updated_at
+    before update
+    on crates
+    for each row
+execute procedure set_updated_at_ignore_downloads();

migrations/2024-03-04-144026_change-crates-updated-at-trigger/up.sql

@@ -0,0 +1,8 @@
+drop trigger trigger_crates_set_updated_at
+    on crates;
+
+create trigger trigger_crates_set_updated_at
+    before update
+    on crates
+    for each row
+execute procedure set_updated_at();