v1.23.3: Dependency updates, Alpine base image refresh, and CI actions update

Maintenance & Dependency Updates

• Python Dependencies (#215):
• Updated fastapi from 0.161.1 to 0.162.0
• Updated pydantic from 2.14.1 to 2.14.2
• Updated pydantic-core from 2.50.1 to 2.50.2
• Updated ruff from 0.17.2 to 0.17.3
• Updated opentelemetry-api from 1.45.1 to 1.45.2
• Maintained strict parity between uv.lock and cf-tunnel-sync/requirements.txt
• Base Images (#213, #214):
• Refreshed python:3.11-alpine base image digest in cf-tunnel-sync/Dockerfile (#213)
• Refreshed nginx:alpine base image digest in cf-tunnel-dashboard/Dockerfile (#214)
• CI / GitHub Actions (#216):
• Updated astral-sh/setup-uv to v10.3.3 pinned commit SHA in ci.yml and fuzzing.yml

Validation & Reviews

• All 367 tests passing across Python 3.11, 3.12, 3.13, and 3.14.
• All hermetic gates, OSV security scans, and CodeQL analyses verified green.
• Reviews approved by @MustermenschAlex, @kuenstlichedummheit-sys, and @majorungustl.