Update version tag for sdlpixels.inc

Author: Free-Pascal-meets-SDL-Website

units/sdl2.pas

@@ -135,7 +135,7 @@ interface
 {$I sdlatomic.inc}               // 2.0.20
 {$I sdlmutex.inc}                // 2.0.14 WIP
 {$I sdltimer.inc}                // 2.0.18
-{$I sdlpixels.inc}               // 2.0.14 WIP
+{$I sdlpixels.inc}               // 2.26.5
 {$I sdlrect.inc}                 // 2.24.0
 {$I sdlrwops.inc}                // 2.0.14
 {$I sdlaudio.inc}                // 2.26.3