Update wisp to v0.5.4 (inbound worker use-after-free crash fix)

[kwsantiago]

Bumps the packaged wisp to v0.5.4.

• Dockerfile: WISP_VERSION v0.5.3 → v0.5.4, WISP_COMMIT c811d1c... (commit-guarded). Still ReleaseSafe.
• startos/versions/current.ts: 0.5.4:0 with release notes.

What v0.5.4 fixes

The relay no longer crashes (SIGSEGV) a few hours into sustained client traffic. http.zig's inbound connection worker had a use-after-free (a connection freed on a .signal and dereferenced on a .recv in the same event batch). Confirmed stable across 13+ hours of real load, vs crashing every ~3h before.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f02af317-ae92-468a-b698-3f751224da10

📥 Commits

Reviewing files that changed from the base of the PR and between 455538b and 4d2de93.

📒 Files selected for processing (2)

• Dockerfile
• startos/versions/current.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/update-wisp-0.5.4

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