Security: Final dependency updates for complete security coverage

- Update requests: 2.32.4 → 2.32.5 (latest stable)
- Update certifi: 2024.7.4 → 2025.8.3 (latest certificate bundle)
- Ensures complete security coverage for all HTTP and SSL operations
- All tests still passing (179 passed, 7 skipped)
- Safety check still reports 0 vulnerabilities
- Ready for secure v0.9.0 release with comprehensive security fixes

Author: howethomas