loki update to 5.21.0-bb.0

Package Merge Request

Package Changes

• Updated docker.io/grafana/loki-canary 2.8.4 -> 2.9.0
• Updated ironbank/opensource/grafana/loki 2.8.4 -> 2.9.0
• Updated registry1.dso.mil/ironbank/opensource/grafana/loki 2.8.4 -> 2.9.0

Package MR

big-bang/product/packages/loki!100 (merged)

big-bang/product/packages/loki!98 (merged)

For Issue

Closes big-bang/product/packages/loki#60 (closed)