Add missing copyright for pitch shift

COPYRIGHT.txt

@@ -145,6 +145,12 @@ Copyright: 2001, Robert Penner
  2007-2014, Juan Linietsky, Ariel Manzur
 License: Expat
 
+Files: servers/audio/effects/audio_effect_pitch_shift.cpp
+Copyright: 2014-present Godot Engine contributors
+ 2007-2014 Juan Linietsky, Ariel Manzur
+ 1999-2015 Stephan M. Bernsee <s.bernsee [AT] zynaptiq [DOT] com>
+License: Expat and WOL
+
 Files: ./servers/rendering/renderer_rd/shaders/effects/tonemap.glsl
 Comment: NVidia's FXAA 3.11, simplified by Simon Rodriguez
 Copyright: 2014-2015, NVIDIA CORPORATION
@@ -2273,6 +2279,15 @@ License: Unlicense
  .
  For more information, please refer to <https://unlicense.org/>
 
+License: WOL
+                          The Wide Open License (WOL)
+ .
+ Permission to use, copy, modify, distribute and sell this software and its
+ documentation for any purpose is hereby granted without fee, provided that
+ the above copyright notice and this license appear in all source copies.
+ THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY OF
+ ANY KIND. See https://dspguru.com/wide-open-license/ for more information.
+
 License: Zlib
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages