chore: bump version to 1.0.3 and upgrade dependencies

Update dependencies to latest versions:
- testcontainers: 0.23.1 → 0.26.3
- testcontainers-modules: 0.11.4 → 0.14.0
- tokio-postgres: 0.7.13 → 0.7.15
- reqwest: 0.13 → 0.13.1

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: j7nw4r