credits: Update links to Will Provost's album "The Living Proof"

Amazon's store link was still "http://" instead of "https://", and since they
don't have the physical CD in stock anymore (and probably won't ever again), I
added a link to the album on Amazon Music, for those that want to access it.

examples/audio/03-load-wav/load-wav.c

@@ -11,7 +11,8 @@
  *    Publisher: 5 Guys Named Will
  *    Copyright 1996 Will Provost
  *    https://itunes.apple.com/us/album/the-living-proof/id4153978
- *    http://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH
+ *    https://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH
+ *    https://music.amazon.com/albums/B0G39SYDX1
  */
 
 #define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */

test/LICENSE.txt

@@ -28,7 +28,8 @@ You can get a copy of the full song (and album!) from iTunes...
 
 or Amazon...
 
-    http://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH
+    https://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH
+    https://music.amazon.com/albums/B0G39SYDX1
 
 Thanks to Will for permitting us to distribute this sample with SDL!