v1.21.1

OS Changes

• Update host containers (#4153)

Build Changes

• Use workspace dependencies for all dependencies (#4132)

Twoliter

• Update bottlerocket-core-kit to v2.3.5 (#4156, #4152, #4143, #4139)
• Update Twoliter to v0.4.5 (#4159)

Settings Extensions

• Update bottlerocket-settings-models to v0.3.0 (#4145)

README changes

• Update command for SSM Start session on host container (#4129) - Thanks @Veronica4036!