automation: use newer Windows base image
It looks like the old base image disappeared. Let's use a newer
image that exists today.
Differential Revision: https://phab.mercurial-scm.org/D6671
--- a/contrib/automation/hgautomation/aws.py Mon Jul 22 17:44:19 2019 -0700
+++ b/contrib/automation/hgautomation/aws.py Mon Jul 22 18:52:58 2019 -0700
@@ -1048,7 +1048,7 @@
image = find_image(ec2resource,
'801119661308',
- 'Windows_Server-2019-English-Full-Base-2019.02.13')
+ 'Windows_Server-2019-English-Full-Base-2019.07.12')
config = {
'BlockDeviceMappings': [