backstage update to 2.5.3-bb.1

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/backstage/-/blob/2.5.3-bb.1/CHANGELOG.md

Package MR

big-bang/product/packages/backstage!80 (merged)

For Issue

Closes issue

Upgrade Notices

"N/A"