fix string cast (msvc issue) #238

Job	Run time
build (windows-qt6-msvc, windows-latest, -G"Visual Studio 17 2022", msys2 {0}, D:/deps, windows, ...	1m 25s
build (windows-qt5-msvc, windows-latest, -G"Visual Studio 17 2022", msys2 {0}, D:/deps, windows, ...	1m 23s
build (windows-qt6-mingw, windows-latest, msys2 {0}, D:/deps, none, win64_msvc2019_64, D:/Qt, msv...	1m 23s
build (windows-qt5-mingw, windows-latest, msys2 {0}, D:/deps, none, win64_mingw73, D:/Qt, mingw73...	1m 25s
build (linux-qt6, ubuntu-latest, bash, /home/runner/deps, none, gcc_64, /home/runner/Qt, gcc_64, ...	1m 27s
build (linux-qt5, ubuntu-22.04, bash, /home/runner/deps, none, gcc_64, /home/runner/Qt, gcc_64, 5...	1m 17s
build (macos-qt6-universal, macos-latest, -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64", bash, /Users/...	1m 33s
build (macos-qt5-legacy, macos-latest, -DCMAKE_OSX_DEPLOYMENT_TARGET="10.13" -DCMAKE_OSX_ARCHITEC...	1m 31s
publish	0s
	11m 24s

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