Update docker

Changes:

- https://github.com/docker-library/docker/commit/f6a0c42: Update 20.10 to 20.10.6

library/docker

@@ -4,22 +4,22 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/docker.git
 
-Tags: 20.10.5, 20.10, 20, latest
+Tags: 20.10.6, 20.10, 20, latest
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 9728dce92752348ac2623bcf96436f1a89e15dd3
+GitCommit: f6a0c427f0354dcf5870c430c72c8f1d6b4e6d5e
 Directory: 20.10
 
-Tags: 20.10.5-dind, 20.10-dind, 20-dind, dind
+Tags: 20.10.6-dind, 20.10-dind, 20-dind, dind
 Architectures: amd64, arm32v6, arm32v7, arm64v8
 GitCommit: 094faa88f437cafef7aeb0cc36e75b59046cc4b9
 Directory: 20.10/dind
 
-Tags: 20.10.5-dind-rootless, 20.10-dind-rootless, 20-dind-rootless, dind-rootless
+Tags: 20.10.6-dind-rootless, 20.10-dind-rootless, 20-dind-rootless, dind-rootless
 Architectures: amd64
-GitCommit: 9728dce92752348ac2623bcf96436f1a89e15dd3
+GitCommit: f6a0c427f0354dcf5870c430c72c8f1d6b4e6d5e
 Directory: 20.10/dind-rootless
 
-Tags: 20.10.5-git, 20.10-git, 20-git, git
+Tags: 20.10.6-git, 20.10-git, 20-git, git
 Architectures: amd64, arm32v6, arm32v7, arm64v8
 GitCommit: 387e351394bfad74bceebf8303c6c8e39c3d4ed4
 Directory: 20.10/git