Update CI actions to v19 #1129

Job	Run time
Linux -> Pre-checks	16s
Linux -> Clang-x64, Release	11m 49s
Linux -> Clang-x64, Debug	8m 58s
Linux -> GCC-x64, Release	9m 26s
Linux -> GCC-x64, Debug	8m 28s
Linux -> Clang-ASAN-x64, RelWithDebInfo	13m 47s
	52m 44s

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