chore(deps): bump certifi from 2025.4.26 to 2025.6.15 in /hack/api-docs (#4915)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2025.4.26 to 2025.6.15.
- [Commits](https://github.com/certifi/python-certifi/compare/2025.04.26...2025.06.15)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2025.6.15
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

hack/api-docs/requirements.txt

@@ -1,5 +1,5 @@
 Babel==2.17.0
-certifi==2025.4.26
+certifi==2025.6.15
 charset-normalizer==3.4.2
 click==8.1.8
 colorama==0.4.6