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Add gcc 15 and clang 21 to linux CI and update actions/checkout #36

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Run time

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Job	Run time
clang 20 - xsimd-tbb	7m 33s
clang 20 - xsimd	5m 58s
gcc 14 - xsimd	5m 43s
gcc 14 - xsimd-tbb	5m 59s
	25m 13s