build(deps): bump certifi from 2025.11.12 to 2026.1.4

Bumps [certifi](https://github.com/certifi/python-certifi) from 2025.11.12 to 2026.1.4.
- [Commits](certifi/python-certifi@2025.11.12...2026.01.04)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2026.1.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 alembic==1.16.5
 annotated-types==0.7.0
 anyio==4.12.0
-certifi==2025.11.12
+certifi==2026.1.4
 charset-normalizer==3.4.4
 click==8.3.1
 dnspython==2.8.0