env/windows: update windows image versions

Use the latest non-deprecated versions of our supported Windows versions
on GCP.

Updates golang/go#35006

Change-Id: Ia3e3f0ec62e3515c181b7766625156ca5acc4e21
Reviewed-on: https://go-review.googlesource.com/c/build/+/406859
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Alex Rakoczy <alex@golang.org>
Run-TryBot: Alex Rakoczy <alex@golang.org>
diff --git a/env/windows/make.bash b/env/windows/make.bash
index b5ac9cc..707b888 100755
--- a/env/windows/make.bash
+++ b/env/windows/make.bash
@@ -9,9 +9,9 @@
 declare -A public_images
 
 public_images=(
-         ['server-2016-v7']='windows-server-2016-dc-core-v20180612'
-         ['server-2008r2-v7']='windows-server-2008-r2-dc-v20180612'
-         ['server-2012r2-v7']='windows-server-2012-r2-dc-core-v20180612'
+         ['server-2016-v8']='windows-server-2016-dc-core-v20220513'
+         ['server-2008r2-v8']='windows-server-2008-r2-dc-v20220513'
+         ['server-2012r2-v8']='windows-server-2012-r2-dc-core-v20220513'
        )
 
 mkdir -p out