Bump gh-aw-mcpg to v0.4.31 and gh-aw-firewall to v0.28.57

Update the pinned dependency versions to the latest requested releases:

Acceptance criteria

Update all repository references and generated artifacts that pin either dependency.
Regenerate any affected compiled files using the repository-standard commands.
Run the relevant formatting, unit tests, and validation checks.
Document any follow-up work required by behavior or compatibility changes in these releases.