fix: opendkim/final.lua: Delete up to 10 Authentication-Results headers

There can be more than one header

cmdeploy/src/cmdeploy/opendkim/final.lua

@@ -31,9 +31,14 @@ end
 if valid then
 	-- Strip all DKIM-Signature headers after successful validation
 	-- Delete in reverse order to avoid index shifting.
-	for i = nsigs, 1, -1 do
+	for i = nsigs - 1, 0, -1 do
 		odkim.del_header(ctx, "DKIM-Signature", i)
 	end
+
+	-- Delete up to 10 Authentication-Results headers
+	for i = 9, 0, -1 do
+		odkim.del_header(ctx, "Authentication-Results", 0)
+	end
 else
 	odkim.set_reply(ctx, "554", "5.7.1", error_msg)
 	odkim.set_result(ctx, SMFIS_REJECT)