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] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -29,7 +29,7 @@ ndg-httpsclient==0.5.1
 urllib3==2.6.2  # requests, sentry-sdk
 chardet==5.2.0  # requests
 idna==3.11  # requests
-certifi==2025.11.12  # requests, sentry-sdk
+certifi==2026.1.4  # requests, sentry-sdk
 requests==2.32.5
 python-cas==1.7.1
 django-cas-ng==5.1.0