Bump newest CUDA version to 12.6 #746

Job	Run time
Doxygen check	17s
Compute matrix	3s
Verify Dev Containers / Verify devcontainers	10s
CUDA11.8 gcc / amd64 / Build gcc11/C++17 / Build gcc11/C++17	2m 17s
CUDA12.6 gcc / amd64 / Build gcc13/C++17 / Build gcc13/C++17	5m 9s
CUDA12.6 gcc / amd64 / Build gcc12/C++17 / Build gcc12/C++17	4m 52s
CUDA12.6 gcc / arm64 / Build gcc12/C++17 / Build gcc12/C++17	8m 21s
Verify Dev Containers / List devcontainers	4s
Verify Dev Containers / cuda12.6-gcc13	1m 44s
Verify Dev Containers / cuda12.5-gcc13	6s
Verify Dev Containers / cuda12.6-gcc13	1m 44s
Verify Dev Containers / cuda12.4-gcc12	7s
Verify Dev Containers / cuda12.6-gcc12	1m 18s
Verify Dev Containers / cuda11.8-gcc11	56s
Verify Dev Containers / cuda12.5-gcc12	11s
CUDA11.8 gcc / amd64 / Test gcc11/C++17 / Test gcc11/C++17	6m 56s
CUDA12.6 gcc / amd64 / Test gcc12/C++17 / Test gcc12/C++17	6m 7s
CUDA12.6 gcc / amd64 / Test ${{ inputs.test_name }}	0s
CUDA12.6 gcc / arm64 / Test ${{ inputs.test_name }}	0s
CI success	1s
	40m 23s

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