Enable C++20 for platforms where it's turned on for `v4r14-patches`

Enable C++20 for platforms where it's turned on

See merge request !1512 (merged)

(cherry picked from commit 9e416f68)

7f955484 Detect CXX standard based on Gaudi or ROOT to allow support for C++20 e47b01fc Fix passing of standard for CUDA compilation and issue with libfmt 316178cf [CMake] Fix if statements if libfmt is not found b99deae2 [CI] switch to LCG_105a, x86_64_v3-el9-gcc13+cuda12_4-opt+g, and hence C++20 f66ce50e Update gcc12 to gcc13 everywhere 8de6a9c6 Ignore false positive warning in racecheck test

Co-authored-by: Miroslav Saur miroslav.saur@cern.ch