[Rspamd] Increase task timeout to prevent expensive tasks to cause a timeout; Set max size for macro scans to 3 MiB

data/conf/rspamd/local.d/external_services.conf

@@ -6,5 +6,5 @@ oletools {
   # mime-part regex matching in content-type or filename
   # block all macros
   extended = true;
-  max_size = 5242880;
+  max_size = 3145728;
 }