ci: install liblzma in CI for Windows builds

Author: ntamas

.github/workflows/build.yml

@@ -241,7 +241,7 @@ jobs:
       - name: Install VCPKG libraries
         run: |
           %VCPKG_INSTALLATION_ROOT%\vcpkg.exe integrate install
-          %VCPKG_INSTALLATION_ROOT%\vcpkg.exe install libxml2:${{ matrix.vcpkg_arch }}-windows-static-md
+          %VCPKG_INSTALLATION_ROOT%\vcpkg.exe install liblzma:${{ matrix.vcpkg_arch }}-windows-static-md libxml2:${{ matrix.vcpkg_arch }}-windows-static-md
         shell: cmd
 
       - name: Build wheels