misc. C++20 cleanups

• prefer concepts or requires clauses over SFINAE with std::enable_if
• prefer defaulted operator<=>

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• 0f1771eb - misc. C++20 cleanups

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/ci-test

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• [2025-03-12 16:59] Validation started with lhcb-master-mr#12862
• [2025-03-12 22:04] Validation started with lhcb-master-mr#12868
• [2025-03-14 11:14] Validation started with lhcb-master-mr#12882
• [2025-03-15 15:43] Validation started with lhcb-master-mr#12893
• [2025-03-15 17:09] Validation started with lhcb-master-mr#12894
• [2025-03-15 18:04] Validation started with lhcb-master-mr#12895
• [2025-03-15 22:31] Validation started with lhcb-master-mr#12896
• [2025-03-16 11:09] Validation started with lhcb-master-mr#12900
• [2025-03-19 08:53] Validation started with lhcb-master-mr#12938

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• 0f5b0b39 - misc. C++20 cleanups

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assigned to @jonrob

Thanks @graven merging is on hold now whilst we migrate to LCG 106. I hand over to @msaur so reassigning to him now for next week.

assigned to @msaur and unassigned @jonrob

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• 0bb62dc3 - replace SFINAE with concepts/requires

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• 79603df3 - replace SFINAE with concepts/requires

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• 79603df3...68433407 - 2 commits from branch master
• ddef5037 - misc. C++20 cleanups
• 9dbbb2b0 - replace SFINAE with concepts/requires

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mentioned in issue Moore#927 (closed)

mentioned in issue Moore#936

mentioned in merge request Rec!4205