Update docker

Changes:

- https://github.com/docker-library/docker/commit/947e37e: Merge pull request https://github.com/docker-library/docker/pull/209 from AkihiroSuda/bump-up-rootlesskit
- https://github.com/docker-library/docker/commit/cd00995: update RootlessKit to v0.7.1

library/docker

@@ -16,7 +16,7 @@ Directory: 19.03/dind
 
 Tags: 19.03.5-dind-rootless, 19.03-dind-rootless, 19-dind-rootless, stable-dind-rootless, test-dind-rootless, dind-rootless
 Architectures: amd64
-GitCommit: cbe1c220b3d43715ddd712cf93e8fb2e3c32429c
+GitCommit: cd0099524944dd1ad368421ec042e0ec9ef53a47
 Directory: 19.03/dind-rootless
 
 Tags: 19.03.5-git, 19.03-git, 19-git, stable-git, test-git, git