feat: Install version 3.6.0 of the edx_proctoring library into edx-platform.

This release adds a new permission check when rendering the practice proctored exam view. If a learner is not in a paid enrollment track, the learner will no longer be able to use proctoring software in a practice proctored exam. As with other proctored exams, learners not in a paid enrollment track will see the exam content. This uses the 'can_take_proctored_exam' permission.