Use atomic<int> instead of atomic_ref #607

Job	Run time
Compute matrix	4s
Doxygen check	15s
Verify Dev Containers / Verify devcontainers	7s
CUDA11.8 gcc / amd64 / Build gcc11/C++17 / Build gcc11/C++17	3m 21s
CUDA12.4 gcc / amd64 / Build gcc12/C++17 / Build gcc12/C++17	4m 0s
CUDA12.4 gcc / arm64 / Build gcc12/C++17 / Build gcc12/C++17	4m 5s
Verify Dev Containers / List devcontainers	3s
Verify Dev Containers / cuda12.4-gcc12	1m 0s
Verify Dev Containers / cuda11.8-gcc11	1m 0s
Verify Dev Containers / cuda12.4-gcc12	56s
CUDA11.8 gcc / amd64 / Test gcc11/C++17 / Test gcc11/C++17	6m 22s
CUDA12.4 gcc / amd64 / Test gcc12/C++17 / Test gcc12/C++17	6m 37s
CUDA12.4 gcc / arm64 / Test ${{ inputs.test_name }}	0s
CI success	1s
	27m 51s

Provide feedback