sdl12-compat: Updated copyright for 2023.

From b48b470b15ff64c769a2463b08842b297067e575 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 28 Mar 2023 11:14:32 -0400
Subject: [PATCH] Updated copyright for 2023.

---
 LICENSE.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/LICENSE.txt b/LICENSE.txt
index a41260a29..b25acf74f 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,4 +1,4 @@
-Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
 
 This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages