daemon: Fix build with GCC 13.

The sqlite.hh file uses fixed-width integer types from stdint.h. As
such, it needs to include <cstdint>. Without this include, the file
doesn't compile successfully with GCC13.

See: https://gcc.gnu.org/gcc-13/porting_to.html#header-dep-changes

* nix/libstore/sqlite.hh: include <cstdint>

Signed-off-by: Sören Tempel <soeren@soeren-tempel.net>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

nix/libstore/sqlite.hh

@@ -2,6 +2,7 @@
 
 #include <functional>
 #include <string>
+#include <cstdint>
 
 #include "types.hh"