Get rid of 'from future' lines in python scripts in testsuite #7355

Job	Run time
macos-12 appleclang13/C++17 py3.10 MacOS-12	18m 43s
macos-13 appleclang14/C++17 py3.11 MacOS-13	20m 46s
VFX2020 gcc6/C++14 py3.7 boost1.70 exr2.4 ocio1.1	9m 14s
Ubuntu latest releases gcc12 C++17 avx2 exr3.2 ocio2.3	6m 38s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	13m 25s
VFX2021 gcc9/C++17 py3.7 boost1.73 exr2.5 ocio2.0	7m 43s
windows-2019 VS2019	20m 14s
VFX2021 clang10/C++14 avx2 exr2.5 ocio2.0	12m 10s
windows-2022 VS2022	21m 15s
VFX2022 gcc9/C++17 py39 boost1.76 exr3.1 ocio2.1	11m 25s
Ubuntu bleeding edge gcc13 C++20 py3.10 OCIO/libtiff/exr-master boost1.74 avx2	7m 7s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	11m 37s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	9m 59s
VFX2022 icc/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	10m 32s
Ubuntu debug gcc9/C++17, sse4.2, exr2.4	13m 2s
VFX2022 icx/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	14m 47s
Ubuntu static libs gcc9 C++17 exr2.4	6m 11s
VFX2022 sanitizers	29m 35s
Ubuntu clang-format	2m 20s
VFX2023 gcc11/C++17 py3.10 boost1.80 exr3.1 ocio2.2	6m 58s
VFX2024 gcc11/C++17 py3.11 boost1.82 exr3.2 ocio2.3	7m 39s
VFX2021 oldest/hobbled gcc9.3/C++17 py3.7 boost-1.66 exr-2.4 no-sse no-ocio	15m 21s
VFX2023 abi check	6m 50s
	4h 43m 31s

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