Update gitlab_git to 10.6.6
What does this MR do?
This updates gitlab_git to version 10.6.6
Are there points in the code the reviewer needs to double check?
No.
Why was this MR needed?
10.6.4/10.6.5/10.6.6 contains some changes regarding marking blobs as binary, this can improve page loading times.
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 you do - rebase it please) -
Squashed related commits together