ci: Update URL of our re-hosted Qt binaries

.gitlab/ci/download_qt.cmake

@@ -14,7 +14,7 @@ set(qt_tar_workdir ".gitlab")
 # Files needed to download.
 set(qt_files)
 if ("$ENV{CMAKE_CONFIGURATION}" MATCHES "windows.*package")
-  set(qt_url_root "https://cmake.org/files/dependencies")
+  set(qt_url_root "https://cmake.org/files/dependencies/qt")
   set(qt_url_path "")
   if ("$ENV{CMAKE_CONFIGURATION}" MATCHES "windows_x86_64_package")
     list(APPEND qt_files "qt-5.15.10-win-x86_64-msvc_v142-1.zip")
@@ -64,7 +64,7 @@ elseif ("$ENV{CMAKE_CONFIGURATION}" MATCHES "windows")
   set(qt_url_path "${qt_platform}/desktop/qt5_${qt_version_nodot}/qt.qt5.${qt_version_nodot}.${qt_abi}")
 elseif ("$ENV{CMAKE_CONFIGURATION}" MATCHES "macos")
   if ("$ENV{CMAKE_CONFIGURATION}" MATCHES "macos10.10_package")
-    set(qt_url_root "https://cmake.org/files/dependencies")
+    set(qt_url_root "https://cmake.org/files/dependencies/qt")
     set(qt_url_path "")
     list(APPEND qt_files "qt-5.9.9-macosx10.10-x86_64-arm64.tar.xz")
     set(qt_subdir "qt-5.9.9-macosx10.10-x86_64-arm64")