include cstdint to fix compilation error on gcc 13

[toge]

I met compilation error on gcc 13. (work fine on gcc 12)

In file included from PDFWriter/DocumentContext.h:29,
                 from PDFWriter/PDFWriter.h:30,
                 from test_package.cpp:2:
/PDFWriter/TIFFImageHandler.h:142:9: error: ‘uint64_t’ does not name a type
  142 | typedef uint64_t tsize_t_compat;
      |         ^~~~~~~~
PDFWriter/TIFFImageHandler.h:83:1: note: ‘uint64_t’ is defined in header ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
   82 | #include <list>
  +++ |+#include <cstdint>
   83 | #include <utility>

As compiler suggested, this patch include cstdint.
Please merge it if possible.

[galkahana]

oh. Sorry for the trouble and thank you for your contribution. @toge. i merged for now, but do you mind checking if including '#include <stdint.h>' solves the problem instead? it'll support c99 and not just c11+, which is what i prefer.

[toge]

@galkahana
Sorry, I forget that.
#include <stdint.h> is also fine to work. (I tested on gcc 13)

[galkahana]

Awsome thanks! So if you dont mind later today ill replace with stdint. following I will release a minor version.
Thanks again for letting me know and providing the correction.