Fix Windows build

ERROR: failed to solve: failed to compute cache key: mount callback failed on /tmp/containerd-mount1917080101: link /tmp/containerd-mount1917080101/Windows/INF/basicrender.inf /tmp/containerd-mount1917080101/Windows/System32/DriverStore/FileRepository/basicrender.inf_amd64_efdc64af60c69a6d/basicrender.inf: no such file or directory
Error: Process completed with exit code 1.

According to [1], we need to use ltsc2022 as a tag.

[1] microsoft/Windows-Containers#493

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

scripts/build_funcs.sh

@@ -13,7 +13,7 @@ LINUX_ARCH=(amd64 arm64 ppc64le s390x)
 
 # Currently only under a single arch, can iterate over these and still assume arch value.
 WIN_ARCH=amd64
-WINVERSIONS=("1809" "1903" "1909" "2004" "20H2")
+WINVERSIONS=("ltsc2022")
 
 # Not used for pushing images, just for local building on other GOOS. Defaults to
 # grabbing from the local go env but can be set manually to avoid that requirement.