Removed six dependency in tools/git since it breaks hermetic builds

[c4rtune]

git_configure.bzl uses the host python to run tools/git/gen_git_source.py

It looks like in a cross compatibility migration (tensorflow/tensorflow@c396546) a six dependency was added. If building on a completely vanilla system, this will break if six is not installed on the host. Ideally, this should be done with python provided by bazel, but these rules are called during tf_workspace, bind, etc... So I think this approach is acceptable.

Small change, but also adds consistency! See https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/git/gen_git_source.py#L171

[MonnetalX]

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#1 git_configure.bzl

🔍 The host Python script in git_configure.bzl should avoid importing six to maintain hermetic builds on systems without it.

#2 tools/git/gen_git_source.py

🔍 The six library dependency in tools/git/gen_git_source.py breaks hermetic builds because it relies on the host Python environment having six installed, which is not guaranteed in a clean build system.

#3 tensorflow/tensorflow@c396546

🔍 The commit introduced a six dependency in gen_git_source.py that breaks hermetic builds when six is not available on the host system.

#4 https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/git/gen_git_source.py#L171

🔍 Removing the six dependency from tools/git/gen_git_source.py ensures hermetic builds by eliminating reliance on an external Python package that may not be available on vanilla systems.