fix(ci): resolve macOS build and Pages deployment issues

- Add missing <unistd.h> include for _SC_PAGESIZE on macOS
- Downgrade configure-pages action to v5 to fix TypeError

Author: LessUp

.github/workflows/pages.yml

@@ -25,7 +25,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Pages
-        uses: actions/configure-pages@v6
+        uses: actions/configure-pages@v5
         with:
           static_site_generator: vitepress
 

examples/02-memory-cache/include/memory_utils.hpp

@@ -13,6 +13,11 @@
 #include <new>
 #include <vector>
 
+// POSIX headers for sysconf
+#if defined(__unix__) || defined(__APPLE__)
+#include <unistd.h>
+#endif
+
 namespace hpc::memory {
 
 //------------------------------------------------------------------------------