build!: Move to Python 3.7 minimum #5414

Job	Run time
windows-2019 VS2019	48m 51s
Ubuntu latest releases gcc12 C++17 avx2 exr3.2 ocio2.3	11m 56s
windows-2022 VS2022	1h 10m 54s
macos-12 appleclang13/C++17 py3.10 MacOS-12	35m 35s
Ubuntu bleeding edge gcc13 C++20 py3.10 OCIO/libtiff/exr-master boost1.74 avx2	2m 54s
macos-13 appleclang14/C++17 py3.11 MacOS-13	24m 11s
VFX2021 gcc9/C++17 py3.7 boost1.73 exr2.5 ocio2.0	12m 23s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	9m 53s
VFX2021 clang10/C++17 avx2 exr2.5 ocio2.0	11m 38s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	8m 51s
Ubuntu debug gcc9/C++17, sse4.2, exr2.4	12m 54s
VFX2022 gcc9/C++17 py39 boost1.76 exr3.1 ocio2.1	10m 58s
Ubuntu static libs gcc9 C++17 exr2.4	10m 23s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	10m 42s
Ubuntu clang-format	2m 22s
VFX2022 icc/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	15m 41s
VFX2022 icx/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	14m 6s
VFX2022 sanitizers	30m 13s
VFX2023 gcc11/C++17 py3.10 boost1.80 exr3.1 ocio2.2	11m 33s
VFX2024 gcc11/C++17 py3.11 boost1.82 exr3.2 ocio2.3	7m 43s
VFX2021 oldest/hobbled gcc9.3/C++17 py3.7 boost-1.66 exr-2.4 no-sse no-ocio	13m 8s
VFX2023 abi check	11m 25s
	6h 28m 14s

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