Revert "[CMake] Actually require python 3.6 or greater" There are builders that do not have python 3.6. Revert until this situation can be rectified This reverts commit 0703b0753c40dad30f1683403f6600bd2cb42055. GitOrigin-RevId: d3e8b9fdc0de18ff92764f1be0a9b5a13fbbe9de
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