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Add clang 21 to linux CI and update actions/checkout #37

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Run time

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Job	Run time
clang 20 - xsimd	7m 21s
clang 20 - xsimd-tbb	8m 7s
gcc 14 - xsimd	6m 10s
gcc 14 - xsimd-tbb	6m 0s
	27m 38s