ci: For clarity, use the term 'runner' instead of 'os' (#1743) #3001

Job	Run time
macos-12 appleclang13/C++17 py3.10 MacOS-12	29m 20s
Ubuntu Debug gcc7/C++14 llvm9 py2.7 oiio2.3 exr2.4 sse4 boost1.65 exr2.4	38m 3s
macos-13 appleclang14/C++17 py3.11 MacOS-13	10m 18s
VFX2019 gcc6/C++14 llvm9 py2.7 boost1.66 exr2.4 oiio2.3 sse2	9m 54s
Ubuntu gcc10/C++17 llvm10 oiio-release boost1.65 exr2.5 avx2	7m 19s
VFX2019 clang9/C++14 llvm9 oiio-release boost1.66 avx2 exr2.4 py2.7	9m 11s
Ubuntu latest releases gcc11/C++17 llvm15 boost1.71 exr3.2 py3.9 avx2 batch-b16avx512	40m 8s
VFX2020 gcc6/C++14 llvm10 py3.7 boost1.70 exr2.4 oiio2.2 sse4	8m 55s
Ubuntu bleeding edge gcc12/C++17 llvm16 oiio/ocio/exr/pybind-master boost1.71 py3.10 avx2 batch-b16avx512	19m 18s
VFX2021 gcc9/C++17 llvm11 py3.7 boost1.73 exr2.5 oiio2.3 avx2 batch-b8avx2	21m 36s
Ubuntu clang14/C++17 llvm14 boost1.71 exr3.1 py3.8 avx2 batch-b16avx512	20m 9s
VFX2022 gcc9/C++17 llvm13 py3.9 boost1.76 exr3.1 oiio-rel avx2	27m 18s
VFX2022 clang12/C++17 llvm12 oiio-master boost1.73 exr3.1 py3.9 avx2 batch-avx512	29m 15s
VFX2022 icc/C++17 llvm14 py3.9 boost1.76 exr3.1 oiio-master avx2	24m 55s
VFX2022 icx/C++17 llvm14 py3.9 boost1.76 exr3.1 oiio2.3 avx2	32m 56s
VFX2023 gcc11/C++17 llvm15 py3.10 boost1.80 exr3.1 oiio-rel avx2	28m 0s
VFX2023 GPU Cuda11 gcc11/C++17 llvm15 py3.10 boost1.80 exr3.1 OIIO-master avx2	7m 5s
VFX2019 oldest everything gcc6/C++14 llvm9 py2.7 boost1.66 oiio2.3 no-simd exr2.4	9m 6s
VFX2022 sanitizers	31m 41s
VFX2022 clang-format	3m 58s
	6h 48m 25s

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