chore: update extension versions in community catalog (#2468)

* chore: update extension versions in community catalog

- Update architecture-guard from v1.4.0 to v1.6.7
- Update memory-md from v0.7.5 to v0.7.9
- Update security-review from v1.4.2 to v1.4.5

All extensions now point to latest release downloads.

* chore: update timestamps in community catalog

Co-authored-by: Copilot <copilot@github.com>

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Co-authored-by: Copilot <copilot@github.com>