Windows CI: explicitly use windows-2019 instead of using windows-latest
Windows CI: explicitly use windows-2019 instead of using windows-latest

Reviewed-by: Shane Lontis <452ce16516ceed26291fe7de3f8b53540d83864e@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/17234)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl