v1.1.4

chore(release): bump version to v1.1.4 (#1)

## Summary
- Bump package version to `v1.1.4` across `pyproject.toml`,
`server.json`, and `src/sigma_mcp/__init__.py`.
- Proactively address Sigma deprecation: updated `search_members` in
`client.py` to use the `email` query parameter when looking up members
by email address on `GET /v2/members`.
- Standardize Sunday maintenance schedule (API drift check at 04:00 UTC
/ 12:00 AM EDT; Dependabot at 04:30 UTC / 12:30 AM EDT).
- Enhanced parameter and schema drift detection in
`scripts/check_openapi_drift.py`.
- 100.0% statement test coverage verified across all 2,069 statements.