ci: Set MSVC toolset version explicitly

This change avoids toolset incompatibilities that cause linker errors.

.github/workflows/ci.yml

@@ -197,6 +197,8 @@ jobs:
         run: |
           msbuild -version | Out-File -FilePath "$env:GITHUB_WORKSPACE\msbuild_version"
           Get-Content -Path "$env:GITHUB_WORKSPACE\msbuild_version"
+          $env:VCToolsVersion | Out-File -FilePath "$env:GITHUB_WORKSPACE\toolset_version"
+          Get-Content -Path "$env:GITHUB_WORKSPACE\toolset_version"
           $env:CI_QT_URL | Out-File -FilePath "$env:GITHUB_WORKSPACE\qt_url"
           $env:CI_QT_CONF | Out-File -FilePath "$env:GITHUB_WORKSPACE\qt_conf"
 
@@ -279,6 +281,7 @@ jobs:
         run: |
           Set-Location "$env:VCPKG_INSTALLATION_ROOT"
           Add-Content -Path "triplets\x64-windows-static.cmake" -Value "set(VCPKG_BUILD_TYPE release)"
+          Add-Content -Path "triplets\x64-windows-static.cmake" -Value "set(VCPKG_PLATFORM_TOOLSET_VERSION $env:VCToolsVersion)"
           .\vcpkg.exe --vcpkg-root "$env:VCPKG_INSTALLATION_ROOT" integrate install
           git rev-parse HEAD | Out-File -FilePath "$env:GITHUB_WORKSPACE\vcpkg_commit"
           Get-Content -Path "$env:GITHUB_WORKSPACE\vcpkg_commit"
@@ -293,7 +296,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: ~/AppData/Local/vcpkg/archives
-          key: ${{ github.job }}-vcpkg-binary-${{ hashFiles('vcpkg_commit', 'msbuild_version', 'build_msvc/vcpkg.json') }}
+          key: ${{ github.job }}-vcpkg-binary-${{ hashFiles('vcpkg_commit', 'msbuild_version', 'toolset_version', 'build_msvc/vcpkg.json') }}
 
       - name: Generate project files
         run: py -3 build_msvc\msvc-autogen.py