ci: Use avx on macos-12 test #7227

Job	Run time
windows-2019 VS2019	20m 34s
macos-12 appleclang13/C++17 py3.10 MacOS-12	21m 15s
Ubuntu latest releases gcc12 C++17 avx2 exr3.2 ocio2.3	14m 10s
macos-13 appleclang14/C++17 py3.11 MacOS-13	24m 53s
VFX2019 gcc6/C++14 py2.7 boost1.66 exr2.4 ocio1.1	11m 49s
Ubuntu bleeding edge gcc13 C++20 py3.10 OCIO/libtiff/exr-master boost1.74 avx2	11m 55s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	10m 9s
VFX2020 gcc6/C++14 py3.7 boost1.70 exr2.4 ocio1.1	11m 10s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	13m 49s
VFX2021 gcc9/C++17 py3.7 boost1.73 exr2.5 ocio2.0	12m 35s
Ubuntu debug gcc7/C++14, sse4.2, exr2.4	12m 24s
Ubuntu gcc8 C++17 avx exr2.5	9m 34s
VFX2021 clang10/C++14 avx2 exr2.5 ocio2.0	12m 33s
Ubuntu static libs gcc7 C++14 exr2.4	9m 30s
VFX2022 gcc9/C++17 py39 boost1.76 exr3.1 ocio2.1	13m 47s
Ubuntu clang-format	2m 26s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	16m 5s
VFX2022 icc/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	19m 15s
VFX2022 icx/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	14m 45s
VFX2022 sanitizers	34m 13s
VFX2023 gcc11/C++17 py3.10 boost1.80 exr3.1 ocio2.2	12m 36s
VFX2024 gcc11/C++17 py3.11 boost1.82 exr3.2 ocio2.3	13m 6s
VFX2019 oldest/hobbled gcc6.3/C++14 py2.7 boost-1.66 exr-2.4 no-sse no-ocio	11m 54s
VFX2023 abi check	9m 23s
	5h 43m 50s

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