GHA CI: disable security hardening flag

OpenSSL isn't compatible with `/guard:cf` flag so we omit it for now.
Related: openssl/openssl#22554

Closes qbittorrent#20479.
PR qbittorrent#20487.

.github/workflows/ci_windows.yaml

@@ -50,15 +50,13 @@ jobs:
             -Force `
             -ItemType File `
             -Path "${{ env.vpkg_triplet_path }}/x64-windows-static-md-release.cmake"
+          # OpenSSL isn't compatible with `/guard:cf` flag so we omit it for now, see: https://github.com/openssl/openssl/issues/22554
           Add-Content `
             -Path "${{ env.vpkg_triplet_path }}/x64-windows-static-md-release.cmake" `
             -Value @("set(VCPKG_TARGET_ARCHITECTURE x64)",
               "set(VCPKG_LIBRARY_LINKAGE static)",
               "set(VCPKG_CRT_LINKAGE dynamic)",
-              "set(VCPKG_BUILD_TYPE release)",
-              "set(VCPKG_C_FLAGS /guard:cf)",
-              "set(VCPKG_CXX_FLAGS /guard:cf)",
-              "set(VCPKG_LINKER_FLAGS /guard:cf)")
+              "set(VCPKG_BUILD_TYPE release)")
           # clear buildtrees after each package installation to reduce disk space requirements
           $packages = `
             "openssl:x64-windows-static-md-release",