drop the dep on six

[goneri]

We're Python3 only since day one. We don't need this.

[softwarefactory-project-zuul[bot]]

Build succeeded.

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[softwarefactory-project-zuul[bot]]

Build succeeded (gate pipeline). https://ansible.softwarefactory-project.io/zuul/buildset/6937cfd48c6c4603a653d7daba791f65

:x: ansible-test-sanity-docker-devel FAILURE in 9m 10s (non-voting) :x: ansible-test-sanity-docker-milestone FAILURE in 6m 05s (non-voting) :heavy_check_mark: ansible-test-cloud-integration-vmware-rest SUCCESS in 15m 15s :heavy_check_mark: build-ansible-collection SUCCESS in 10m 26s :heavy_check_mark: ansible-test-splitter SUCCESS in 4m 37s :heavy_check_mark: integration-kubernetes.core-with-turbo-1 SUCCESS in 13m 11s :heavy_check_mark: integration-kubernetes.core-with-turbo-2 SUCCESS in 27m 32s :heavy_check_mark: integration-kubernetes.core-with-turbo-3 SUCCESS in 31m 25s :heavy_check_mark: ansible-tox-linters SUCCESS in 8m 30s :heavy_check_mark: ansible-galaxy-importer SUCCESS in 3m 48s