Add missing include on cstdint to database_impl.hpp (#124)

It won't build on Musl without it due to not knowing about int64_t

Co-authored-by: Bart Ribbers <[email protected]>

src/djinterop/impl/database_impl.hpp

@@ -17,6 +17,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <optional>
 #include <string>
 #include <vector>