Adhere to changed theming API (#165) #498

Job	Run time
prepare_matrix	6s
Cross platform build (Windows-msvc2022, windows-2022, msvc-2022, 17, MD, Release)	2m 29s
Cross platform build (Linux_gcc13, ubuntu-24.04, gcc, g++, gcc, 13, Release, Linux, libstdc++11, ...	2m 30s
Cross platform build (Macos_xcode14.3, macos-13, apple-clang, 14, Release, Macos, 14.3, libc++, x...	1s
Cross platform build (Macos_xcode16, macos-15, apple-clang, 16, Release, Macos, 16.2, libc++, armv8)	2m 46s
	7m 52s

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