chore(deps): bump certifi from 2025.8.3 to 2026.1.4 in /docker

Bumps [certifi](https://github.com/certifi/python-certifi) from 2025.8.3 to 2026.1.4.
- [Commits](certifi/python-certifi@2025.08.03...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]

docker/requirements.txt

@@ -1,5 +1,5 @@
 cachetools==6.2.0
 PyYAML==6.0.2
-certifi==2025.8.3
+certifi==2026.1.4
 kubernetes==33.1.0
 jsonpath-ng==1.7.0