Merge remote-tracking branch 'origin/cpp20' into remove-gsl #2522

Job	Run time
Quick Checks	10s
ubuntu-22.04 / gcc / Debug	25m 19s
windows-2022 / Debug	27m 40s
ubuntu-22.04 / gcc / RelWithDebInfo	27m 22s
Documentation	12m 12s
windows-2022 / RelWithDebInfo	30m 59s
ubuntu-20.04 / clang / Debug	24m 49s
ubuntu-20.04 / clang / RelWithDebInfo	25m 39s
macos-12 / clang / Debug	1s
macos-12 / clang / RelWithDebInfo	1s
	2h 54m 12s

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