[release/2026-04B] Remove unnecessary Dockerfile syntax directive#7142

lbussell merged 3 commits into

release/2026-04Bdotnet/dotnet-docker:release/2026-04Bfrom

backport/pr-7141-to-release/2026-04Bdotnet/dotnet-docker:backport/pr-7141-to-release/2026-04BCopy head branch name to clipboard