Fix AWS git-remote-codecommit SyntaxWarning / Namespace cli_binary_format

Switching from the workaround for the OSX credential Helper 403 Error I tried the AWS git credential helper and could not got it working without fixing some problems.

The Problem

After the installation with `brew install git-remote-codecommit` using git will throw the following warnings:

The Fix

will be fixed when this pull request gets merged:

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