[release/9.0.1xx] Upgrade latest Alpine to 3.21 for VMR builds#45416

mthalman merged 1 commit intorelease/9.0.1xxdotnet/sdk:release/9.0.1xxfrom

backport/pr-45415-to-release/9.0.1xxdotnet/sdk:backport/pr-45415-to-release/9.0.1xxCopy head branch name to clipboard