ci/windows: Update VK-GL-CTS to d48899f85b486a70d090af59a1453763458611d9

This is needed to work around an MSVC compiler bug which causes test failures

Acked-by: David Heidelberg <david@ixit.cz>
Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30877>

.gitlab-ci/windows/mesa_deps_test_deqp.ps1

@@ -14,7 +14,7 @@ New-Item -ItemType Directory -Path "$deqp_source" | Out-Null
 Push-Location -Path $deqp_source
 git init
 git remote add origin https://github.com/KhronosGroup/VK-GL-CTS.git
-git fetch --depth 1 origin 56114106d860c121cd6ff0c3b926ddc50c4c11fd # of branch vulkan-cts-1.3.4
+git fetch --depth 1 origin d48899f85b486a70d090af59a1453763458611d9 # of branch vulkan-cts-1.3.8
 if (!$?) {
   Write-Host "Failed to fetch deqp repository"
   Pop-Location