Draft: Update Twistlock Docker tags to v21.08.520

This MR contains the following updates:

Package	Update	Change
ironbank/twistlock/console/console	patch	21.08.514 -> 21.08.520
ironbank/twistlock/defender/defender	patch	21.08.514 -> 21.08.520
registry1.dso.mil/ironbank/twistlock/console/console	patch	21.08.514 -> 21.08.520

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