[Rspamd] Reduce Sorbs recent score

[Rspamd] Add annoying CSA to bulk symbols and score then with 3.2
[Rspamd] Update to 2.4

data/conf/rspamd/local.d/groups.conf

@@ -9,6 +9,9 @@ symbols {
   "BAD_REP_POLICIES" {
     score = 2.5;
   }
+  "BULK_HEADERS" {
+    score = 3.2;
+  }
 }
 
 group "MX" {