Update year to 2023 (#2846)

* Update year to 2023

* Update raylib.h year to 2023

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2013-2022 Ramon Santamaria (@raysan5)
+Copyright (c) 2013-2023 Ramon Santamaria (@raysan5)
 
 This software is provided "as-is", without any express or implied warranty. In no event 
 will the authors be held liable for any damages arising from the use of this software.

src/raylib.h

@@ -57,7 +57,7 @@
 *   raylib is licensed under an unmodified zlib/libpng license, which is an OSI-certified,
 *   BSD-like license that allows static linking with closed source software:
 *
-*   Copyright (c) 2013-2022 Ramon Santamaria (@raysan5)
+*   Copyright (c) 2013-2023 Ramon Santamaria (@raysan5)
 *
 *   This software is provided "as-is", without any express or implied warranty. In no event
 *   will the authors be held liable for any damages arising from the use of this software.