add missing `#include <cstdint>` to `shell_pair.hpp` #198

Job	Run time
Debug Build and Test	20m 36s
Release Build and Test (gnu, 12, ON, ON)	13m 36s
NVIDIA Build (No Test) (OFF, OFF)	10m 44s
Release Build and Test (gnu, 12, ON, OFF)	16m 57s
NVIDIA Build (No Test) (ON, OFF)	10m 3s
Release Build and Test (gnu, 12, OFF, ON)	11m 13s
NVIDIA Build (No Test) (OFF, ON)	10m 20s
Release Build and Test (gnu, 12, OFF, OFF)	13m 56s
Release Build and Test (llvm, 14, ON, OFF)	13m 15s
Release Build and Test (llvm, 14, OFF, OFF)	10m 39s
Build as Subproject	8m 14s
CMake Discovery	13m 15s
	2h 32m 48s

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