fix(deps): update dependency alembic to >=1.18.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
alembic (changelog)	>=1.18.1 → >=1.18.3

---

Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[claude]

PR Review - Alembic Dependency Update

Summary: ✅ Safe to merge - routine patch version update

Analysis

This PR updates alembic from >=1.18.1 to >=1.18.2 (patch version).

Code Quality: ✅ Clean

• Only touches dependency specifications in pyproject.toml and uv.lock
• No code changes required

Breaking Changes: ✅ None expected

• Patch version (1.18.1 → 1.18.2) follows semver - only bug fixes

Security: ✅ No concerns

• Standard Renovate-managed dependency update

Usage in Codebase:

• Alembic used for database migrations (src/mcp_optimizer/db/config.py:207)
• Migration files: migrations/env.py and version files
• Test coverage exists in conftest.py and multiple test files

Recommendation: Approve and merge once CI passes. This is a routine maintenance update with minimal risk.