Use c++17

Author: Taiju Yamada

.github/workflows/build_windows.yaml

@@ -43,6 +43,6 @@ jobs:
       run: |
         mkdir -p build
         cd build
-        cmake .. -G 'Visual Studio 17 2022' -A x64 -DCMAKE_CXX_STANDARD=11 "-DZeroMQ_DIR=${PWD}\..\libzmq\build" "-DCURL_INCLUDE_DIR=${PWD}\..\curl-8.5.0_1-win64-mingw\include" "-DCURL_LIBRARY=${PWD}\..\curl-8.5.0_1-win64-mingw\lib\libcurl.dll.a" -DCMAKE_CONFIGURATION_TYPES=Release -DOPT_SAMPLES=OFF -DOPT_BUILD_TESTS=OFF
+        cmake .. -G 'Visual Studio 17 2022' -A x64 -DCMAKE_CXX_STANDARD=17 "-DZeroMQ_DIR=${PWD}\..\libzmq\build" "-DCURL_INCLUDE_DIR=${PWD}\..\curl-8.5.0_1-win64-mingw\include" "-DCURL_LIBRARY=${PWD}\..\curl-8.5.0_1-win64-mingw\lib\libcurl.dll.a" -DCMAKE_CONFIGURATION_TYPES=Release -DOPT_SAMPLES=OFF -DOPT_BUILD_TESTS=OFF
         msbuild ALL_BUILD.vcxproj /p:Configuration=Release
         cd ..