MSVC: avifsampletransformtest.cc(153): warning C4244: 'argument': conversion from 'const avifSampleTransformTokenType' to 'uint8_t', possible loss of data

[wantehchang]

Please see https://github.com/AOMediaCodec/libavif/actions/runs/10099659232:

[74/162] Building CXX object tests\CMakeFiles\avifsampletransformtest.dir\gtest\avifsampletransformtest.cc.obj
FAILED: tests/CMakeFiles/avifsampletransformtest.dir/gtest/avifsampletransformtest.cc.obj 
C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1440~1.338\bin\Hostx64\x64\cl.exe  /nologo /TP -DAVIF_ENABLE_EXPERIMENTAL_GAIN_MAP -DAVIF_ENABLE_EXPERIMENTAL_JPEG_GAIN_MAP_CONVERSION -DAVIF_ENABLE_EXPERIMENTAL_METAV1 -DAVIF_ENABLE_EXPERIMENTAL_SAMPLE_TRANSFORM -DAVIF_ENABLE_EXPERIMENTAL_YCGCO_R -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS -ID:\a\libavif\libavif\apps\shared -ID:\a\libavif\libavif\include -external:ID:\a\libavif\libavif\build\_deps\googletest-src\googletest\include -external:ID:\a\libavif\libavif\build\_deps\googletest-src\googletest -external:W0 /DWIN32 /D_WINDOWS /GR /EHsc /MD /O2 /Ob2 /DNDEBUG -std:c++14 /W4 /wd4324 /WX /showIncludes /Fotests\CMakeFiles\avifsampletransformtest.dir\gtest\avifsampletransformtest.cc.obj /Fdtests\CMakeFiles\avifsampletransformtest.dir\ /FS -c D:\a\libavif\libavif\tests\gtest\avifsampletransformtest.cc
D:\a\libavif\libavif\tests\gtest\avifsampletransformtest.cc(153): error C2220: the following warning is treated as an error
D:\a\libavif\libavif\tests\gtest\avifsampletransformtest.cc(153): warning C4244: 'argument': conversion from 'const avifSampleTransformTokenType' to 'uint8_t', possible loss of data
[75/162] Building CXX object tests\CMakeFiles\avif16bittest.dir\gtest\avif16bittest.cc.obj