windows builds: update vcpkg pinned version to 2025.12.12 (#1449)

This is the latest vcpkg release that works without further modifications
to PHD2.  Newer versions of vcpkg require some work to fix
GaussianProcessTest test failure.

Fixes #1448

Author: agalasso

thirdparty/thirdparty.cmake

@@ -73,7 +73,7 @@ if(WIN32)
   FetchContent_Declare(
     vcpkg
     GIT_REPOSITORY https://github.com/microsoft/vcpkg.git
-    GIT_TAG f7423ee180c4b7f40d43402c2feb3859161ef625
+    GIT_TAG 84bab45d415d22042bd0b9081aea57f362da3f35  # 2025.12.12
     UPDATE_COMMAND bootstrap-vcpkg.bat -disableMetrics
     COMMAND ${CMAKE_COMMAND} -E echo "Building vcpkg cfitsio"
     COMMAND vcpkg install --binarysource=default --no-print-usage cfitsio:${WINDOWS_ARCH}-windows
@@ -92,7 +92,7 @@ if(WIN32)
   set(VCPKG_DEBUG_LIB ${VCPKG_PREFIX}/debug/lib)
   set(VCPKG_RELEASE_LIB ${VCPKG_PREFIX}/lib)
   set(VCPKG_INCLUDE ${VCPKG_PREFIX}/include)
-  include_directories(${VCPKG_INCLUDE})
+  include_directories(${VCPKG_INCLUDE} ${VCPKG_INCLUDE}/opencv4)
 endif()
 
 if(APPLE)