[Rspamd] More generous timeout but no retransmit allowed for oletools: prevent further timeouts

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

@@ -7,4 +7,6 @@ oletools {
   # block all macros
   extended = true;
   max_size = 3145728;
+  timeout = 20.0;
+  retransmits = 1;
 }