chore: update AWF firewall to v0.19.1

[Mossaka]

Summary

Update the AWF firewall dependency to v0.19.1. This patch release fixes the .claude.json file bind mount regression (#16214) that prevented Claude Code from writing its config via atomic writes.

Changes in AWF v0.19.1

• fix: Remove .claude.json file bind mount that broke Claude Code atomic writes (gh-aw-firewall#911)
• docs: Add AWF_ONE_SHOT_TOKEN_DEBUG documentation (gh-aw-firewall#867)
• perf: Parallelize container image builds in release workflow (gh-aw-firewall#909)

What to update

Update the pinned AWF image tag in pkg/workflow/awf_helpers.go (or wherever GetAWFImageTag() returns the version) from v0.19.0 to v0.19.1.

Closes #16214