GH Actions: install zlib on Windows

Author: generalmimon

.github/workflows/build.yml

@@ -93,7 +93,7 @@ jobs:
  - name: restore
  run: |
  C:\vcpkg\bootstrap-vcpkg.bat
- C:\vcpkg\vcpkg install gtest:x64-windows
+ C:\vcpkg\vcpkg install gtest:x64-windows zlib:x64-windows
  - name: build
  run: .build\build.ps1 -GTestPath C:\vcpkg\installed\x64-windows
  - name: unittest