Update redis-namespace to 1.6.0
What does this MR do?
Updates redis-namespace from 1.5.2 to 1.6.0.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
To get officially supported for Ruby 2.3/2.4.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests passed for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a Backend maintainer
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Conform by the merge request performance guides -
Conform by the style guides
What are the relevant issue numbers?
Closes #46846 (closed)
Edited by Rémy Coutable