Updated the link for lock free algorithms

Closes https://github.com/libsdl-org/sdlwiki/pull/982

include/SDL3/SDL_atomic.h

@@ -36,7 +36,7 @@
  *
  * There's also lots of good information here:
  *
- * - https://www.1024cores.net/home/lock-free-algorithms
+ * - https://web.archive.org/web/20251113104356/https://1024cores.net/home/lock-free-algorithms
  * - https://preshing.com/
  *
  * These operations may or may not actually be implemented using processor