Added missing #include <cstdio>

For snprintf, for compatibility with GCC 13.
Fixes #312 - thanks @marxin !

include/vk_mem_alloc.h

diff --git a/include/vk_mem_alloc.h b/include/vk_mem_alloc.h
index b787c36..0fe459b 100644
--- a/include/vk_mem_alloc.h
+++ b/include/vk_mem_alloc.h
@@ -2614,6 +2614,10 @@
     #include <bit> // For std::popcount
 #endif
 
+#if VMA_STATS_STRING_ENABLED
+    #include <cstdio> // For snprintf
+#endif
+
 /*******************************************************************************
 CONFIGURATION SECTION