Updated CI with vfx2023 Linux jobs.

[xlietz]

See comments here regarding 2023 updated CI for OpenEXR and Imath:
AcademySoftwareFoundation/openexr#1475

[xlietz]

Per comments from @meshula and @lgritz , I have updated the OpenEXR Linux build matrix as follows:

2023 gcc 11.2.1 python 3.10.9 C++17 - Shared Release
2023 gcc 11.2.1 python 3.10.9 C++17 - Shared Debug
2023 gcc 11.2.1 python 3.10.9 C++17 - Static Release
2023 gcc 11.2.1 python 3.10.9 C++14 - Shared Release
2023 clang 15.0 python 3.10.9 C++17 - Shared Release
2023 clang 14.0 python 3.10.9 C++17 - Shared Release
2022 gcc 9.3.1 python 3.9.7 C++17 - Shared Release
2021 gcc 9.3.1 python 3.7.9 C++17 - Shared Release
2020 gcc 6.3.1 python 3.7.3 C++14 - Shared Release

[cary-ilm]

LGTM, thanks!