backstage update to 2.5.3-bb.0

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/backstage/-/blob/2.5.3-bb.0/CHANGELOG.md

Package MR

big-bang/product/packages/backstage!79 (merged)

For Issue

Closes big-bang/product/packages/backstage#55 (closed)

Upgrade Notices

N/A