Pin openDAQ ref

[alexadereyko]

• Pin opendaq_ref to a specific commit with target-based CMake enforcement
• Wrap external dependencies in ANCIENT CMake mode to allow legacy functions (e.g. include_directories() in GTest)
• Disable force-fetching of dependencies when openDAQ is pre-installed via find_package, preventing FetchContent alias conflicts (e.g. fmt::fmt already exists)
• Work around openDAQ's INSTALL_INTERFACE:fmt::fmt-header-only propagating FMT_HEADER_ONLY=1, which conflicts with compiled fmt::fmt used by spdlog (LNK2005 on MSVC)
• Fix DLL path in CI: use bin/ instead of lib/ for Windows install-build-and-test job

[NikolaiShipilov]

👍