[monitoring-plugins] check_smtp: update year in copyright header

[Franz Schwartau]

 Module: monitoring-plugins
 Branch: master
 Commit: d762fb137401491270c898febe07e34ba200e388
 Author: Franz Schwartau <franz at electromail.org>
   Date: Mon Jun 12 22:09:54 2023 +0200
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=d762fb1

check_smtp: update year in copyright header

---

 plugins/check_smtp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index a1debd2..70191ad 100644
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
@@ -3,7 +3,7 @@
 * Monitoring check_smtp plugin
 * 
 * License: GPL
-* Copyright (c) 2000-2007 Monitoring Plugins Development Team
+* Copyright (c) 2000-2023 Monitoring Plugins Development Team
 * 
 * Description:
 *