fix(deps): update dependency alembic to >=1.18.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
alembic (changelog)	>=1.18.0 → >=1.18.1

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[claude]

PR Review

Summary: Minor patch version bump for alembic (1.18.0 → 1.18.1). This is a low-risk dependency update.

✅ Approved - No Issues Found

• Changes are minimal and properly scoped (pyproject.toml + uv.lock)
• Version constraint uses >= allowing flexibility
• Patch version bumps typically contain bug fixes with no breaking changes
• Lock file updated correctly by Renovate

Recommendations:

• Verify CI passes before merging
• Consider enabling Renovate automerge for patch-level dependency updates to reduce manual overhead

No concerns regarding: code quality, security, performance, or regressions.