Update to gitlab-shell 3.6.6
What does this MR do?
This updates gitlab-shell to version 3.6.6
Does this MR meet the acceptance criteria?
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CHANGELOG entry added - Tests
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All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together