There is an updated pull request by dataCobra against master on the void-packages repository

https://github.com/dataCobra/void-packages moby
https://github.com/void-linux/void-packages/pull/40484

moby: update to 20.10.21.
#### Testing the changes
- I tested the changes in this PR: **briefly**

#### Local build testing
- I built this PR locally for my native architecture, (x86_64)
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - aarch64-musl (crossbuild)
  - armv7l (crossbuild)
  - armv6l-musl (crossbuild)

docker was updates to 20.10.21 but the docker server (moby) is still on 20.10.17. Also I found out that btrfs >= 5.19 as a storage driver is only supported by the newer version.

In the future it would make sense to update moby together with the other docker packages.

A patch file from https://github.com/void-linux/void-packages/pull/40484.patch is attached