Add missing `stdint.h` include
Hi @Tombana This PR is duplicate of [#60299](https://github.com/tensorflow/tensorflow/pull/60299), hence closing it. Thank you for your contribution!
Since a recent compiler update (`gcc (GCC) 13.1.1 20230429`), `spectrogram.cc` fails to compile because `uint32_t` is no longer defined. This PR adds the missing include.

I'm not sure if `<cstdint>` or `<stdint.h>` is preferred. I went with the latter to follow the style of the other includes in the file.